Παραπομπή APA

Spencer, A. J. M. e. a. (1977). Engineering mathematics. Van Nostrand.

Παραπομπή Chicago Style

Spencer, A J M et al.. Engineering Mathematics. New York: Van Nostrand, 1977.

Παραπομπή MLA

Spencer, A J M et al.. Engineering Mathematics. Van Nostrand, 1977.