by Margaret J. Hartman [and others]
Kendall/Hunt, 1976
Buku Teks
by Willis H. Johnson...[et al.]
Holt, Rinehart and Winston, 1974
Buku Teks
by John G. Holt [and others]
Williams & Wilkins, 1993
Buku Teks
Cox, George W., author
Wm. C. Brown, 1996
Buku Teks
Smeins, Fred E., author
Drive Kendall/Hunt, 1978
Buku Teks