Penalver, Rafael A.
Arco Publishing, Inc., 1981
Buku Teks
Penalver, Rafael A.
Arco Publishing, 1984
Buku Teks
edited by Philip E. Sartwell
Meredith Publ., 1965
Buku Teks
Smillie, Wilson G.
Macmillan, 1963
Buku Teks
edited by John M. Last
Appleton Century , 1980
Buku Teks