Gould, Ronald, author
The Benjamin Cumming , 1988
Buku Teks
Ginting, Ruth Endaria Br, author
2013
UI - Tesis (Membership)
Hsu, Lih-Hsing, author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Bollobas, Bela, author
Academic Press, 1978
Buku Teks
Harary, Frank
Addison-Wesley , 1994
Buku Teks