APA (7th ed.) Citation

World Orchid Conference London, England, Royal Horticultural Society (Great Britain), American Orchid Society, & British Orchid Growers' Association. (1960). Proceedings of the Third World Orchid Conference held in London, May 30 - June 22, 1960. Royal Horticultural Society.

Chicago Style (17th ed.) Citation

World Orchid Conference London, England, Royal Horticultural Society (Great Britain), American Orchid Society, and British Orchid Growers' Association. Proceedings of the Third World Orchid Conference Held in London, May 30 - June 22, 1960. London: Royal Horticultural Society, 1960.

MLA (9th ed.) Citation

World Orchid Conference London, England, et al. Proceedings of the Third World Orchid Conference Held in London, May 30 - June 22, 1960. Royal Horticultural Society, 1960.