APA (7th ed.) Citation

Johns, R. J. (1975). Common forest trees of Papua New Guinea. PNG Forestry College.

Chicago Style (17th ed.) Citation

Johns, R. J. Common Forest Trees of Papua New Guinea. Bulolo: PNG Forestry College, 1975.

MLA (8th ed.) Citation

Johns, R. J. Common Forest Trees of Papua New Guinea. PNG Forestry College, 1975.

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