Lord, Kenniston W.
Van Nostrand Reinhold, 1978
Buku Teks SO
Seidman, Arthur H.
Van Nostrand Reinhold, 1984
Buku Referensi
Frederick S. Merritt and Jonathan T. Ricketts, editor
McGraw-Hill, Inc, 1994
Buku Referensi
Mandl, Matthew
Prentice-Hall, 1967
Buku Teks
Huyck, Peter H.
McGraw-Hill, 1980
Buku Teks