The professor who authored that critique has also published in peer-reviewed journals, ones which are directly related to the field, as any cursory examination would reveal:
Gary Kleck - Wikipedia, the free encyclopedia
Gary Kleck : Florida State University College of Criminology & Criminal Justice
If you had actually read the critique, you would have noticed that it criticizes the study on the basis that it is misleading and demonstrates only a spurious association in a small and non-representative sample that fails to control for something as simple and obvious as criminal records-which, by the way, the majority of shooting victims posses, a fact that no new information in that study contradicts. Another control variable that is unaccounted for is whether crime victims actually tried to defend themselves with their fire-arms, a variable which could then be compared to crime victims without fire-arms.
In short, that study is useless, containing no information that was not already widely known and indicating only that people with guns are more likely to be involved in dangerous situations-hardly surprising if someone is motivated to buy a gun for self-defense or for criminal purposes.