Satria Indratmoko, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2012
UI - Skripsi (Open)
Whitmore, T.C., author
Clarendon Press, 1990
Buku Teks
Jacobs, Marius, author
Springer-Verlag, 1981
Buku Teks
Robert Cornraads and five outhers, author
Reader's Digest, 2015
Buku Referensi
Universitas Indonesia, 1992
UI - Skripsi (Membership)