Williams & Wilkins, 1987
Buku Teks
edited by Philip E. Sartwell
Appleton Century Crofts, 1973
Buku Teks
Smillie, Wilson G.
Macmillan, 1963
Buku Teks
Penalver, Rafael A., author
Arco Publishing, Inc., 1981
Buku Teks
Penalver, Rafael A., author
Arco Publishing, 1984
Buku Teks