Anderson, Ronald A., author
South-Western Publishing, 1975
Buku Teks
by Daniel V. Davidson [and others]
Kent, 1987
Buku Teks
J. David Reitzel [and others]
McGraw-Hill, 1990
Buku Referensi
by Ralph C. Hoeber ... [et al.]
McGraw-Hill, 1986
Buku Teks
Lusk, Harold F., 1893-, author
R. D. Irwin, 1966.
Buku Teks