Brown, L. (1960). Stratigraphy of the Blach Ranch-Crystal Falls Section (Upper Pennsylvanian), Northern Stephens County, Texas.
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Chicago-čujuhus (17. p.)
Brown, L.F. Stratigraphy of the Blach Ranch-Crystal Falls Section (Upper Pennsylvanian), Northern Stephens County, Texas. Austin, 1960.
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MLA-čujuhus (9. p.)
Brown, L.F. Stratigraphy of the Blach Ranch-Crystal Falls Section (Upper Pennsylvanian), Northern Stephens County, Texas. 1960.
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