Παραπομπή σε μορφή APA (7η εκδ.)

Zimmermann, H. (1991). Fuzzy set theory and its applications (2nd rev. ed.). Kluwer Academic Publishers.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Zimmermann, H.-J. Fuzzy Set Theory and Its Applications. 2nd rev. ed. Boston: Kluwer Academic Publishers, 1991.

Παραπομπή σε μορφή MLA (9th εκδ.)

Zimmermann, H.-J. Fuzzy Set Theory and Its Applications. 2nd rev. ed. Kluwer Academic Publishers, 1991.