APA (7th ed.) Citation

Riet, R. P. v. d. ABC ALGOL: A portable language for formula manipulation systems. Mathematisch Centrum.

Chicago Style (17th ed.) Citation

Riet, Reind P. van de. ABC ALGOL: A Portable Language for Formula Manipulation Systems. Amsterdam: Mathematisch Centrum.

MLA (9th ed.) Citation

Riet, Reind P. van de. ABC ALGOL: A Portable Language for Formula Manipulation Systems. Mathematisch Centrum.

Warning: These citations may not always be 100% accurate.