Romaine, G. (2015). Rocks, gems, and minerals (Second edition.). FalconGuides.
Cita Chicago Style (17a ed.)Romaine, Garret. Rocks, Gems, and Minerals. Second edition. Guilford, Connecticut: FalconGuides, 2015.
Cita MLA (8a ed.)Romaine, Garret. Rocks, Gems, and Minerals. Second edition. FalconGuides, 2015.
Precaución: Estas citas no son 100% exactas.