Παραπομπή APA

Young, R. J. (1988). Practical prolog. Van Nostrand Reinhold Company.

Παραπομπή Chicago Style

Young, Richard J. Practical Prolog. New York: Van Nostrand Reinhold Company, 1988.

Παραπομπή MLA

Young, Richard J. Practical Prolog. Van Nostrand Reinhold Company, 1988.