Kohn, Karen C., 1978
Rowman & Littlefield, 2015
Buku Teks
Akester, Patricia
Sweet & Maxwel, [Date of publication not identified]
Buku Teks
Akester, Patricia
Sweet & Maxwell, 2008
Buku Referensi
Pianykh, Oleg S.
[, Springer], 2012
eBooks
Barber, Alfred W.
Parker, 1976
Buku Teks