Dunn, Dana S., author
Longman, 2011
Buku Teks
O`Shea, Robert P. (Robert Paul), 1953-, author
Harcourt Brace & Company, 1996
Buku Teks
O`Shea, Robert P. (Robert Paul), 1953-, author
Harcourt Brace Jovanovich, 1993
Buku Teks
Rosnow, Ralph L., author
Wadsworth, 1992
Buku Teks
O`Shea, Robert P. (Robert Paul), 1953-, author
Harcourt , 2000
Buku Teks