Tsurumi, Yoshi
Praeger, 1978
Buku Teks
Nisonger, Thomas E.
Libraries Unlimited, 1992
Buku Referensi
Nisonger, Thomas E.
Libraries Unlimited, 2003
Buku Teks SO
Howe, Hartley Edward
Facts on file, 1987
Buku Teks SO
[edited by] S. Prakash Sethi, Jagdish N. Sheth
Goodyear, 1973
Buku Teks