Fuzzy sets and their applications to cognitive and decision processes
edited by Lotfi A. Zade ... [and others]
Academic Press, 1975
 Buku Teks SO
Klir, George J.
Fuzzi sets and fuzzy logic : theory and applications
Prentice-Hall, 1995
 Buku Teks SO
Klir, George J.
Fuzzy sets, uncertainty, and information
Prentice-Hall, 1988
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Atanassov, Krassimir T.
On intuitionistic fuzzy sets theory
[Springer, Springer], 2012
 eBooks
Lay, Steven R., 1944-
Convex sets and their applications
John Wiley & Sons, 1982
 Buku Teks SO