Westing, John Howard
John Wiley & Sons, 1956
Buku Teks
Kaiser, Edward John
University of Illinois Press, 1995
Buku Teks
Cayer, N. Joseph.
Wadsworth/Thomson Learning, 2004
Buku Teks
Levin, Melvin R
Praeger, 1977
Buku Teks
American Booksellers Association, 1969
Buku Teks