Penalver, Rafael A., author
Arco Publishing, 1984
Buku Teks
Leavel, Hugh Rodman, author
McGraw-Hill, 1958
Buku Teks
edited by John M. Last
Appleton Century , 1980
Buku Teks
editors, John M. Last, Robert B. Wallace ; associate editors, Elizabeth Barrett-Connor [and others]
Appleton & Lange, 1992
Buku Referensi
edited by Philip E. Sartwell
Meredith Publ., 1965
Buku Teks