edited by Edwin D. Kilbourne, Wilson G. Smillie
MacMillan company, 1969
Buku Teks
Last, John M., 1926-, author
Appleton & Lange, 1998
Buku Teks
Last, John M., 1926-, author
McGraw-Hill, 1997
Buku Teks
Penalver, Rafael A., author
Arco Publishing, Inc., 1981
Buku Teks
Penalver, Rafael A., author
Arco Publishing, 1984
Buku Teks