Townsend, Michael, author
The Benjamin Cumming, 1987
Buku Teks
edited by Yousef Alavi, Don R. Lick, Jiuqiang Liu
World Scientific, 1994
Buku Teks
edited by Jack Koolen, Jin Ho Kwak, Xu Ming-Yao
CRC Press, Taylor & Francis Group, 2008
Buku Teks
editor, Bela Bollobas
North-Holland , 1982
Buku Teks
Gould, Ronald, author
The Benjamin Cumming , 1988
Buku Teks