APA (7th ed.) Citation

Papua New Guinea. Department of Forests & Van Royen, P. (1964). Manual of the forest trees of Papua New Guinea. The Department.

Chicago Style (17th ed.) Citation

Papua New Guinea. Department of Forests and P. Van Royen. Manual of the Forest Trees of Papua New Guinea. Port Moresby: The Department, 1964.

MLA (9th ed.) Citation

Papua New Guinea. Department of Forests and P. Van Royen. Manual of the Forest Trees of Papua New Guinea. The Department, 1964.