Spencer, J. E. (1985). Reconnaissance geology of the crest of the Sierra Estrella, central Arizona. [Arizona Bureau of Geology and Mineral Technology?].
Chicago Style (17th ed.) CitationSpencer, Jon E. Reconnaissance Geology of the Crest of the Sierra Estrella, Central Arizona. [Tucson, Ariz.?]: [Arizona Bureau of Geology and Mineral Technology?], 1985.
MLA (9th ed.) CitationSpencer, Jon E. Reconnaissance Geology of the Crest of the Sierra Estrella, Central Arizona. [Arizona Bureau of Geology and Mineral Technology?], 1985.
Warning: These citations may not always be 100% accurate.