Gould, Ronald
The Benjamin Cumming , 1988
Buku Teks
Hsu, Lih-Hsing
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Harary, Frank
Addison-Wesley , 1994
Buku Teks
Chartrand, Gary
McGraw-Hill, 2005
Buku Teks
Balakrishnan, R.
[Springer Science, ], 2012
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