Leavitt, Maribelle Bryde, author
Maribella Bryde Leavitt 1, 1982
Buku Teks
Bomar, Perri J., author
Saunders , 2004
Buku Teks
Hanson, Shirley May Harmon, author
F.A. Davis , 1996
Buku Teks
F. A. Davis , 1996
Buku Teks
Friedman, Marilyn M., author
Prentice-Hall, 2003
Buku Teks