APA (7th ed.) Citation

Survey Congress (18th : 1983 : Lae, Papua New Guinea), & Association of Surveyors of Papua New Guinea. (1983). The challenge of change: 18th Survey Congress, Lae, 1983. Association of Surveyors of Papua New Guinea.

Chicago Style (17th ed.) Citation

Survey Congress (18th : 1983 : Lae, Papua New Guinea), and Association of Surveyors of Papua New Guinea. The Challenge of Change: 18th Survey Congress, Lae, 1983. [Lae]: Association of Surveyors of Papua New Guinea, 1983.

MLA (9th ed.) Citation

Survey Congress (18th : 1983 : Lae, Papua New Guinea), and Association of Surveyors of Papua New Guinea. The Challenge of Change: 18th Survey Congress, Lae, 1983. Association of Surveyors of Papua New Guinea, 1983.