APA (7th ed.) Citation

Prescott-Allen, R., & Prescott-Allen, C. (1990). How many plants feed the world?

Chicago Style (17th ed.) Citation

Prescott-Allen, Robert, and Christine Prescott-Allen. How Many Plants Feed the World? 1990.

MLA (9th ed.) Citation

Prescott-Allen, Robert, and Christine Prescott-Allen. How Many Plants Feed the World? 1990.

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