edited by Philip E. Sartwell
Appleton-Century-Crofts, 1973
Buku Teks SO
Smillie, Wilson G.
Macmillan, 1963
Buku Teks SO
Penalver, Rafael A.
Arco Publishing, 1984
Buku Teks SO
Penalver, Rafael A.
Arco Publishing, 1981
Buku Teks SO
editors, John M. Last, Robert B. Wallace ; associate editors, Elizabeth Barrett-Connor [and others]
Appleton & Lange, 1992
Buku Referensi