Johnson, B. R., Hassemer, J. R., & Hannigan, B. J. (1986). Mineral Resources of the Papa Keal and Zapata Creek wilderness study areas, Alamosa County, Colorado. United States Government Print. Office.
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Chicago-čujuhus (17. p.)
Johnson, Bruce R., Jerry R. Hassemer, juo Brian J. Hannigan. Mineral Resources of the Papa Keal and Zapata Creek Wilderness Study Areas, Alamosa County, Colorado. Washington: United States Government Print. Office, 1986.
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MLA-čujuhus (9. p.)
Johnson, Bruce R., et al. Mineral Resources of the Papa Keal and Zapata Creek Wilderness Study Areas, Alamosa County, Colorado. United States Government Print. Office, 1986.
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