Cita APA (7th ed.)
Ehlers, E. G., & Blatt, H. (1982). Petrology: Igneous, sedimentary, and metamorphic. Freeman.
Cita Chicago (17th ed.)
Ehlers, Ernest G., i Harvey Blatt. Petrology: Igneous, Sedimentary, and Metamorphic. San Francisco: Freeman, 1982.
Cita MLA (9th ed.)
Ehlers, Ernest G., i Harvey Blatt. Petrology: Igneous, Sedimentary, and Metamorphic. Freeman, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.