Christofides, Nicos, author
Academic Press, 1975
Buku Teks
Chartrand, Gary, author
McGraw-Hill, 1993
Buku Teks
McHugh, James A., author
Prentice-Hall, 1990
Buku Teks
Burkowski, Forbes J., author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Conte, S.D. (Samuel Daniel), author
McGraw-Hill, 1981
Buku Teks