Gould, Ronald
The Benjamin Cumming , 1988
Buku Teks
Gross, Jonathan L.
Chapman & Hall/CRC Taylor & Francis Group, 2006
Buku Teks
Hsu, Lih-Hsing
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Bollobas, Bela
Academic Press, 1978
Buku Teks
Chartrand, Gary
McGraw-Hill, 2005
Buku Teks