APA (7th ed.) Citation

Howcroft, N. H. S. (1979). Tree improvement and seed procurement activities in Papua New Guinea: Progress report 1974-1978. s.n.].

Chicago Style (17th ed.) Citation

Howcroft, N. H. S. Tree Improvement and Seed Procurement Activities in Papua New Guinea: Progress Report 1974-1978. [s.l: s.n.], 1979.

MLA (9th ed.) Citation

Howcroft, N. H. S. Tree Improvement and Seed Procurement Activities in Papua New Guinea: Progress Report 1974-1978. s.n.], 1979.