Παραπομπή APA

Troelstra, A., & Dalen, V. D. (1991). Constructivism in Mathematics: An Introduction. North - Holland.

Παραπομπή Chicago Style

Troelstra, A.S, και Van D. Dalen. Constructivism in Mathematics: An Introduction. Amsterdam: North - Holland, 1991.

Παραπομπή MLA

Troelstra, A.S, και Van D. Dalen. Constructivism in Mathematics: An Introduction. North - Holland, 1991.