Brand, Norman, author
St.Martin`s Press, 1976
Buku Teks
Eulau, Heinz, author
Feffer and Simons, 1963
Buku Teks
Austen, Jane, author
Collins, 1953
Buku Teks
Cialdini, Robert B., author
Quill, 1993
Buku Teks
Roos, Raymon S., author
Prentice-Hall, 1985
Buku Teks