Larson, R., & Hostetler, R. (2007). Trignometry (7th ed.). Houghton Mifflin.
Chicago Edition CitationLarson, Ron, i Robert Hostetler. Trignometry. 7th ed. Houghton Mifflin, 2007.
Cita MLALarson, Ron, i Robert Hostetler. Trignometry. 7th ed. Houghton Mifflin, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.