APA (7th ed.) Citation

Johns, . R. J. (1982). New Guinea ferns and fern allies: Prospects for research. Papua New Guinea University of Technology.

Chicago Style (17th ed.) Citation

Johns, Robert J. New Guinea Ferns and Fern Allies: Prospects for Research. [Lae]: Papua New Guinea University of Technology, 1982.

MLA (9th ed.) Citation

Johns, Robert J. New Guinea Ferns and Fern Allies: Prospects for Research. Papua New Guinea University of Technology, 1982.