Charles E. Tutle Co.Inc, 1959,
Buku Referensi
Fairbairn, Gavin
McGraw-Hill, 2012
Buku Teks SO
John Hartley [and others]
Rinehart and Winston, 1962
Buku Teks
Barnet, Sylvan
Bedford/St. Martin's, 2002
Buku Teks
Dean, Howard H.
Prentice-Hall, 1962
Buku Teks