Lusk, Harold F., 1893-, author
R. D. Irwin, 1966.
Buku Teks
Anderson, Ronald A., author
South-Western Publishing, 1975
Buku Teks
Kerr, Thomas S., author
John Wiley & Sons, 1952
Buku Teks
J. David Reitzel [and others]
McGraw-Hill, 1990
Buku Referensi
by Ralph C. Hoeber ... [et al.]
McGraw-Hill, 1986
Buku Teks