by Margaret J. Hartman [and others]
Kendall/Hunt, 1976
Buku Teks
by Willis H. Johnson...[et al.]
Holt, Rinehart and Winston, 1974
Buku Teks
Lawson, Anton E.
McGraw-Hill, 1995
Buku Teks
McCourt, Richard M.
McGraw-Hill, 1990
Buku Referensi
Keeton, William T.
W.W. Norton, 1970
Buku Teks