Oskamp, Stuart, author
Sage, 1985
Buku Teks
edited by Stuart Oskamp
Sage Publications, 1985
Buku Teks
edited by Warren L. Smith and Ronald L. Teigen
Ill R. D. Irwin , 1970
Buku Teks
edited by David Hine and Hussein Kassim
Routledge, 1998
Buku Teks
Schikele, Rainer, author
McGraw-Hill, 1954
Buku Teks