Shannon, Faith
Reed International Books, 1987
Buku Referensi
Landau, Sidney I.
Cambridge University Press, 2001
Buku Referensi
Krevitsky, Nik
Reinhold Book, 1964
Buku Teks SO
Alixim Gorky ... [and others]
Progress, 1972.
Buku Teks
Eble, Kenneth E.
Jossey-Bass, 1979
Buku Teks