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