APA (7th ed.) Citation

Hilliard, O. M., & Burtt, B. L. (1971). Streptocarpus: An African plant study. University of Natal Press.

Chicago Style (17th ed.) Citation

Hilliard, O. M., and B. L. Burtt. Streptocarpus: An African Plant Study. Pietermaritzburg: University of Natal Press, 1971.

MLA (9th ed.) Citation

Hilliard, O. M., and B. L. Burtt. Streptocarpus: An African Plant Study. University of Natal Press, 1971.