editor, Ernest Kay
Melrose Press Ltd., 1995
Buku Referensi
by David C. McClelland ... [and others]
Appleton-Century-Crolts, 1953
Buku Teks
Morris, Lynn Lyons, author
Sage, 1985
Buku Teks
McClelland, David Clarence, author
Free Press, 1971
Buku Teks
LeVine, Robert A., author
The University of Chicago Press, 1969
Buku Teks