Gaya APA

Saputra, A., Mapping, T, C, I, O, S, A. (1990). GPS 90: Proceedings Second International Symposium on Precise Positioning with the Global Positioning Systems, Ottawa, Canada September 3-7, 1990 . Ottawa: Canadian Institute of Surveying & Mapping.

Gaya MLA

Saputra, Agus., Mapping, The, Canadian, Institute, Of, Surveying, And. "GPS 90: Proceedings Second International Symposium on Precise Positioning with the Global Positioning Systems, Ottawa, Canada September 3-7, 1990". Ottawa: Canadian Institute of Surveying & Mapping, 1990. Text.