Hammond, J.D.
Foresman and Company, 1968
Buku Teks
Willett, Allan H.
University of Pennsylvania Press, 1951
Buku Teks
by Herbert S. Denenberg ... [et al.]
Prentice-Hall, 1964
Buku Teks
Harrington, Scott E.
McGraw-Hill, 2004
Buku Teks
Harrington, Scott E.
McGraw-Hill, 2003
Buku Teks