Heimstra, Norman W.
Brooks/Cole, 1974
Buku Teks
by Paul A. Bell ... [and others]
Wadsworth/Thomson Learning, 2001
Buku Teks
Bell, Paul A.
Thomson, 2001
Buku Teks
edited by Linda Steg, Agnes E. van den Berg, Judith I.M. de Groo
BPS Blackwell, 2013
Buku Teks
edited by Linda Steg and Judith I.M. de Groot
John Wiley & Sons, 2019
Buku Teks