edited by Alvin Sullivan
Greenwood Press, 1986
Buku Referensi
McFarland, Dora
Mass. Heath , 1968
Buku Teks
Lewis, Harold Maclean
John Wiley & Sons, 1957
Buku Teks
Noyes, Arthur P.
W.B. Saunders , 1958
Buku Teks
Noyes, Arthur P.
WB. Saunders, 1964
Buku Teks