edited by Henderikus J. Stam
Sage Publications, 1998
Buku Teks
Blackburn, Julian, author
Kegan Paul, Trench, Trubner, 1947
Buku Teks
Blackburn, Julian, author
Routledge & Kegan Paul, 1953
Buku Teks
Sage Publications, 2009
eBooks
American Psychology Association, 1996
Buku Teks