APA (7th ed.) Citation

Johns, R. J. (1976). Common forest trees of Papua New Guinea. Forestry College.

Chicago Style (17th ed.) Citation

Johns, Robert J. Common Forest Trees of Papua New Guinea. Bulolo: Forestry College, 1976.

MLA (9th ed.) Citation

Johns, Robert J. Common Forest Trees of Papua New Guinea. Forestry College, 1976.

Warning: These citations may not always be 100% accurate.