Stanhope, Marcia, author
EGC, 1998
Buku Teks
Leedam, Elizabeth J., author
McGraw-Hill , 1972
Buku Teks
Clark, Mary Jo, author
Appleton & Lange, 1999
Buku Teks
Clark, Mary Jo, author
Appleton & lange , 1999
Buku Teks
edited by Barbara Walton Spradley
J.B. Lippincott , 1991
Buku Teks