Penalver, Rafael A., author
Arco Publishing, 1984
Buku Teks
edited by Philip E. Sartwell
Meredith Publ., 1965
Buku Teks
Penalver, Rafael A., author
Arco Publishing, Inc., 1981
Buku Teks
Ionrossa, author
1996
UI - Skripsi (Membership)
Smillie, Wilson G.
Macmillan, 1963
Buku Teks