Chartrand, Gary
McGraw-Hill, 2005
Buku Teks
Gould, Ronald
The Benjamin Cumming , 1988
Buku Teks
Hsu, Lih-Hsing
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Bollobas, Bela
Academic Press, 1978
Buku Teks
Harary, Frank
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Buku Teks