Samuel Walker, C. M. (2005). The police in american an introduction.
Trích dẫn kiểu ChicagoSamuel Walker, Charles M.Katz. The Police in American an Introduction. 2005.
MLA引文Samuel Walker, Charles M.Katz. The Police in American an Introduction. 2005.
警告：这些引文格式不一定是100％准确.