Muller, Herbert J.
Harper & Row, 1963
Buku Teks SO
Kadt, J. de
G.A. Van Oorschot, 1946
Buku Klasik
Oever, Karel van den
J.J. Romen & Zonen, [Date of publication not identified]
Buku Teks
Nemo, Philippe
Duquesne University Press, 2006
Buku Teks SO
Brinton, Crane, 1898-1968
Prentice-Hall, 1964
Buku Teks SO