edited by Barbara Walton Spradley
Little, Brown, 1986
Buku Teks
edited by Allan McNaught
Chapman and Hall , 1991
Buku Teks
Paterson, Robert G. (Robert Gildersleeve), author
McGraw-Hill, 1950
Buku Teks
Clark, Mary Jo, author
Appleton & Lange, 1999
Buku Teks
Stanhope, Marcia, author
Mosby , 2002
Buku Teks