Kelley, Pearce Clement
Prentice-Hall, 1957
Buku Teks SO
Brown, Paul L.
Ronald Press, 1953
Buku Teks SO
Bellenger, Danny N.
Richard D. Irwin, 1983
Buku Teks SO
Cahill, Jane
Fairchild Publications, 1960
Buku Teks SO
McNair, Malcolm P.
McGraw-Hill, 1937
Buku Teks SO