Heatfield, David F.
Macmillan, 1971
Buku Teks
edited by Milton Abramowitz, Irene A. Stegun
U.S. Government Printing Office, 1967
Buku Referensi
Universitas Indonesia, 2009
UI - Skripsi (Open)
Wegert, Elias, author
[Springer, ], 2012
eBooks
Luke, Yudell L., author
Academic Press, 1977
Buku Teks