APA (7th ed.) Citation

Dube, L. S., & Lyons, K. J. (1981). Geometry for surveyors (Preliminary edition.). [s.n.].

Chicago Style (17th ed.) Citation

Dube, Lilia Semilla, and K. J. Lyons. Geometry for Surveyors. Preliminary edition. Lae: [s.n.], 1981.

MLA (9th ed.) Citation

Dube, Lilia Semilla, and K. J. Lyons. Geometry for Surveyors. Preliminary edition. [s.n.], 1981.