APA (7th ed.) Citation

World's Poultry Congress Copenhagan, World's Poultry Science Association, Baelum, J., & Nielsen, A. (1948). Official report.

Chicago Style (17th ed.) Citation

World's Poultry Congress Copenhagan, World's Poultry Science Association, Johan Baelum, and Axel Nielsen. Official Report. Copenhagen, 1948.

MLA (8th ed.) Citation

World's Poultry Congress Copenhagan, et al. Official Report. 1948.