APA (7th ed.) Citation

(1980). Congressus numerantium. Utilitas Mathematica Pub. Inc..

Chicago Style (17th ed.) Citation

Congressus Numerantium. Winnipeg: Utilitas Mathematica Pub. Inc., 1980.

MLA (9th ed.) Citation

Congressus Numerantium. Utilitas Mathematica Pub. Inc., 1980.