APA (7th ed.) Citation

(1990). 30th International Mathematical Olympiad: Braunschweig 1989 ; problems and results. Bock.

Chicago Style (17th ed.) Citation

30th International Mathematical Olympiad: Braunschweig 1989 ; Problems and Results. Bad Honnef: Bock, 1990.

MLA (9th ed.) Citation

30th International Mathematical Olympiad: Braunschweig 1989 ; Problems and Results. Bock, 1990.

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