edited by Ronald L. Sakaguchi and John M. Powers
Elsevier Mosby, 2012
Buku Teks
Spence, Catherine Helen
Penguin Books, 1984
Buku Teks
Seven Seas, 1958
Buku Teks
Knopper, Helen
Contact, 1989
Buku Teks
Augur, Helen
Doubleday & Company, Inc., 1954
Buku Teks