Saez, Eileen Elliott de, author
Facet Pub, 2002
Buku Teks
Boss, Richard W., author
G.K. Hall Publishers, 1987
Buku Teks
edited by Colin Harris
Taylor Graham, 1987
Buku Teks
DeLong, J. Bradford, author
McGraw-Hill, 2002
Buku Teks
Hyman, David N., author
Richard D. Irwin, 1971
Buku Teks