this attention thing is really just a secondary thing, which derives from seeing the relevance(due to trusting it) in either subjective or objective aspect of a function, therefore orienting self according to that(and therefore being focusing attention on that).
i think it would be important to talk about the subjective and objective aspects. objective meaning in line with the external world, and subjective meaning in line with the thoughts, feelings, internal perceptions etc, which
arise from(but are not strict copies of) the external world. for example an objective thing might be something that you learned from school years ago and use the learned thing as it was taught to you. even tho it is evoked from within at the moment, but the thing you are using it for is oriented according to the learned information. subjective factor would be you taking what you learned in school years ago, developing the concept further and orienting self according to this newly constructed thing, instead of just using the information you had as it was, or is motivated more of his impressions of those learned things, not the learned thing itself. this is the whole point behind introversion and extraversion, extraverts mainly orient themselves according to the objective factor(as they have extraverted dominant function) and introverts according to the subjective factor.
"An introverted consciousness can be well aware of external conditions, but is not motivated by them."
"Everyone whose attitude is introverted thinks, feels, and acts in a way that clearly demonstrates that the subject is the prime motivating factor and that the object is of secondary importance." [Ibid., par. 769.]
"Jung believed that introversion and extraversion were present in everyone, but that one attitude-type is invariably dominant. When external factors are the prime motivating force for judgments, perceptions, affects and actions, we have an extraverted attitude or type."
"Extraversion is characterized by interest in the external object, responsiveness, and a ready acceptance of external happenings, a desire to influence and be influenced by events, a need to join in and get "with it," the capacity to endure bustle and noise of every kind, and actually find them enjoyable, constant attention to the surrounding world, the cultivation of friends and acquaintances, none too carefully selected, and finally by the great importance attached to the figure one cuts."["Psychological Typology," CW 6, par. 972.]
"In general, the extravert trusts what is received from the outside world and is not inclined to examine personal motivations."
"Although everyone is affected by objective data, the extravert’s thoughts, decisions and behavior are determined by them. Personal views and the inner life take second place to outer conditions."
"The psychic life of the extreme extraverted type is enacted wholly in reaction to the environment, which determines the personal standpoint. If the mores change, he adjusts his views and behavior patterns to match. This is both a strength and a limitation."
"Extraversion is an asset in social situations and in relating to the external environment. But a too-extraverted attitude may result in sacrificing oneself in order to fulfil what one sees as objective demands-the needs of others, for instance, or the requirements of an expanding business."
"This is the extravert’s danger: He gets sucked into objects and completely loses himself in them."[ Ibid., par. 565.]
(quotes from
http://www.nyaap.org/jung-lexicon)
you should also mention the differing definitions to introversion and extraversion, first talk about this from jungian point of view(jung coined the terms after all), then move onto big5 type of definitions, which mainly focus on the social and dominance aspects of extraversion and explain the differences between the two different ways of viewing the same thing.
i dont think those books you listed will be any good for your project, since they are all looking at the thing from one perspective and disregarding where the ideas were developed and how they are mainly used today. those books would be more suited on some personal development speech.
edit.
also you might want to mention object relations theory, as its the basis for this whole introversion/extraversion thing