Potter, Merle C.
Prentice-Hall, 1997
Buku Teks SO
Potter, Merle C.
CT Cengage Learning, 2012
Buku Teks SO
Lu, Pau-chang
Holt, Rinehart and Winston, 1973
Buku Teks SO
Rouse, Hunter
Wiley Eastern Private, 1946
Buku Teks SO
Shames, Irving H.
McGraw-Hill, 1982
Buku Teks SO