APA (7th ed.) Citation

Johns, R. J. (1983). Common forest trees of Papua New Guinea (Rev. ed. 1983.). PNG University of Technology.

Chicago Style (17th ed.) Citation

Johns, R. J. Common Forest Trees of Papua New Guinea. Rev. ed. 1983. LAe: PNG University of Technology, 1983.

MLA (9th ed.) Citation

Johns, R. J. Common Forest Trees of Papua New Guinea. Rev. ed. 1983. PNG University of Technology, 1983.