Ault, Addison, author
Holbrook Press, 1973
Buku Teks
by Royston M. Roberts ... [et al.]
Rinehart and Winston, 1969
Buku Teks
Beyer, Hans, author
[Publisher not identified], [Date of publication not identified]
Buku Teks
Solomons, T. W. Graham, author
John Wiley & Sons, 1992
Buku Teks
Fessenden, Ralph J., author
Wadsworth, 1979
Buku Teks