APA (7th ed.) Citation

American Society of Agronomy, National Fertilizer Association (1925-1955), & Bear, F. E. (1949). Hunger signs in crops: A symposium (Rev. ed.). American Society of Agronomy and National Fertilizer Association.

Chicago Style (17th ed.) Citation

American Society of Agronomy, National Fertilizer Association (1925-1955), and Firman E. Bear. Hunger Signs in Crops: A Symposium. Rev. ed. Washington: American Society of Agronomy and National Fertilizer Association, 1949.

MLA (9th ed.) Citation

American Society of Agronomy, et al. Hunger Signs in Crops: A Symposium. Rev. ed. American Society of Agronomy and National Fertilizer Association, 1949.