edited by: John Halligan and Chris Paris
Longman Chesire, 1984
Buku Teks
Meinar Dewi Pujansari
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 1999
UI - Skripsi Membership
Abrahamson, Mark
Prentice-Hall, 1980
Buku Teks
Gans, Herbert J.
The Free Press, 1982
Buku Teks
John Hopkins University Press, 1990
Buku Teks