Gaya APA

Onsrud, H, J. ([s.a.]). Geographic and land information systems for practicing surveyors and a compendium . Bethesda: American Congress on Surveying & Mapping.

Gaya MLA

Onsrud, Harland, J.. "Geographic and land information systems for practicing surveyors and a compendium". Bethesda: American Congress on Surveying & Mapping, [s.a.]. Cetak.