APA (7th ed.) Citation

Keay, R. W., Onochie, C. F., & Stanfield, D. P. Nigerian trees. Fed. Dep. of Forest Research.

Chicago Style (17th ed.) Citation

Keay, Ronald W., C. F. Onochie, and D. P. Stanfield. Nigerian Trees. Ibadan: Fed. Dep. of Forest Research.

MLA (9th ed.) Citation

Keay, Ronald W., et al. Nigerian Trees. Fed. Dep. of Forest Research.