edited by Muir Gray and Godfrey Fowler
Oxford University Press, 1983
Buku Teks
Penalver, Rafael A.
Arco Publishing, Inc., 1981
Buku Teks
Penalver, Rafael A.
Arco Publishing, 1984
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