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
Chin, Yee Wah
Pearson Prentice Hall, 2004
Buku Teks