APA (7th ed.) Citation

Bonnett, C., Steiner, A., & Turvil, P. (2011). LETTERS. Horticulture Week, 16.

Chicago Style (17th ed.) Citation

Bonnett, Chris, Adam Steiner, and Philip Turvil. "LETTERS." Horticulture Week 2011: 16.

MLA (9th ed.) Citation

Bonnett, Chris, et al. "LETTERS." Horticulture Week, 2011, p. 16.