edited by Robert M. Hashway
Praeger, 1990
Buku Referensi
Rankin, Sally H.
Lippincott , 2001
Buku Teks
edited by Betty P. Mathews
Third Party Publishing, 1982
Buku Teks
Babcock, Dorothy E.
Mosby , 1994
Buku Teks
Carty, Barbara
Springer Publishing, 2000
Buku Teks