APA   Click to copy
Tien, L., Davis, A., Benjamin, G. A. F., & Arnold, T. H. (2012). Ethics for psychologists: A casebook approach. Sage.

Chicago/Turabian   Click to copy
Tien, Liang, Amy Davis, G. Andrew F. Benjamin, and Thomas H. Arnold. Ethics for Psychologists: A Casebook Approach. Sage, 2012.

MLA   Click to copy
Tien, Liang, et al. Ethics for Psychologists: A Casebook Approach. Sage, 2012.

@book{tien2012a,
  title = {Ethics for psychologists: A casebook approach},
  year = {2012},
  publisher = {Sage},
  author = {Tien, Liang and Davis, Amy and Benjamin, G. Andrew F. and Arnold, Thomas H.}
}