APA (7e ed.) Bronvermelding

Papua New Guinea, Holloway, R. S., & Knight, M. J. (1973). Land resources and agricultural potential of the Markham Valley. Land Utilization Section, Dept. of Agriculture, Stock and Fisheries.

Chicago (17e ed.) Bronvermelding

Papua New Guinea, R. S. Holloway, en M. J. Knight. Land Resources and Agricultural Potential of the Markham Valley. Port Moresby: Land Utilization Section, Dept. of Agriculture, Stock and Fisheries, 1973.

MLA (9e ed.) Bronvermelding

Papua New Guinea, et al. Land Resources and Agricultural Potential of the Markham Valley. Land Utilization Section, Dept. of Agriculture, Stock and Fisheries, 1973.