APA (7th ed.) Citation

Gorzkowski, W. (1990). XX International Physics Olympiad: Poland 16-24 July 1989. World Scientific.

Chicago Style (17th ed.) Citation

Gorzkowski, Waldemar. XX International Physics Olympiad: Poland 16-24 July 1989. Singapore: World Scientific, 1990.

MLA (8th ed.) Citation

Gorzkowski, Waldemar. XX International Physics Olympiad: Poland 16-24 July 1989. World Scientific, 1990.

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