Gaya APA

hohenwarter, M., sudrajat, A. (). Geogebra Help Official Manual 3.0 . [s.i.]: http://www.geogebra.org.

Gaya MLA

hohenwarter, Markus., sudrajat, Aam. "Geogebra Help Official Manual 3.0". [s.i.]: http://www.geogebra.org, . Text.