Cooper, Alfred M.
McGraw-Hill, 1952
Buku Teks
Reitell, Charles
New York, The Ronald Press Company
Buku Teks
Cerami, Charles A.
Prentice-Hall, 1957
Buku Teks
Schleh, Edward C.
McGraw-Hill, 1984
Buku Teks
Odiorne, George S.
WED International, [Date of publication not identified]
Buku Teks SO