Clark, Mary Jo, author
Appleton & lange , 1999
Buku Teks
edited by Barbara Walton Spradley
Little, Brown, 1986
Buku Teks
Hitchcock, Janice E., author
Delmar, 1999
Buku Teks
Bailliere Tindall, 1996
Buku Teks
Smith, Claudia M., author
W.B. Saunders , 2000
Buku Teks