Habermas, Jurgen, author
Heinemann, 1974
Buku Teks
Gray, Colin S., author
Routledge, 2006
Buku Teks
Olds, Linda E., author
State University of New York Press, 1992
Buku Teks
edited by Pamela G. Reed and Nelma B. Crawford Shearer
Wolters Kluwer Health/ Lippincott Williams; Wilkins, 2012
Buku Teks
Ryan, Michael, 1951-, author
Wiley-Blackwell, 2017
Buku Teks SO