Golomb, Louis
The University Press of Hawaii, 1978
Buku Teks
Chand, Emcee, author
[Publisher not identified], 1957
Buku Teks
Edoardo Siani, author
Artikel Jurnal
Graham, Gaelle, author
Hodder & Stoughton, 1991
Buku Teks
Gilhooly, Helen, author
McGraw-Hill, 2004
Buku Teks