edited by Evan Gradick Pattishall, Jr.
McGraw-Hill, 1986
Buku Teks
Bates, Barbara, author
J. B. Lippincott Company, 1987
Buku Teks
National Learning Corporation, 1991
Buku Referensi
Molitoris, Joseph J
Research and Education Association, 1996
Buku Teks
Green, Judith
Mc Graw-Hill, 1979
Buku Teks