Riley, D. B. (1993). Sources of sulfur in Piedmont Springs, National Historic Site, Grimes County, Texas. [publisher not identified].
Chicago Style (17th ed.) CitationRiley, Donald Berry. Sources of Sulfur in Piedmont Springs, National Historic Site, Grimes County, Texas. [Place of publication not identified]: [publisher not identified], 1993.
MLA (9th ed.) CitationRiley, Donald Berry. Sources of Sulfur in Piedmont Springs, National Historic Site, Grimes County, Texas. [publisher not identified], 1993.
Warning: These citations may not always be 100% accurate.