Moon, Parker Thomas, author
Macmillan, 1926
Buku Referensi
Wright, Quincy, author
Appleton-Century-Crofts, 1955
Buku Teks
Forsythe, David P., 1941-, author
Cambridge University Press, 2000
Buku Teks
Hodgson, John S., author
Prentice-Hall, 1983
Buku Teks
Pirages, Dennis C.
Duxbury Press, 1978
Buku Teks