McCourt, Richard M., author
McGraw-Hill, 1990
Buku Referensi
by Willis H. Johnson...[et al.]
Holt, Rinehart and Winston, 1974
Buku Teks
Tillery, Bill W., author
McGraw-Hill, 2008
Buku Teks
Hill, David J., author
Mosby Elsevier, 2012
Buku Teks
Frantz, Harper W., author
W.H. Freeman, 1968
Buku Teks