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Bridwell, Margaret M. (Bridwell 1952) The Story of Mammoth Cave National Park Kentucky: A Brief History 11th Edition 1971. (First edition copyright 1952.) No ISBN.

Hoskins, R. Taylor Faithful Visitor First Park Superintendent R. Taylor Hoskins describes the yearly visits of "Pete" a tame summer tanager (Piranga rubra). In The Regional Review, Vol VII, 1 and 2 (July–August 1941)

Hovey, Horace Carter (Hovey 1880) One Hundred Miles in Mammoth Cave in 1880: an early exploration of America's most famous cavern. with introductory note by William R. Jones. Golden, Colorado: Outbooks. (Copyright 1982)

Hovey, Horace Carter Hovey's Handbook of The Mammoth Cave of Kentucky: A Practical Guide to the Regulation Routes. (John P. Morton & Company, Louisville, Kentucky, 1909). Full text transcription.

Watson, Richard A., ed. (Watson 1981) The Cave Research Foundation: Origins and the First Twelve Years 1957–1968 Mammoth Cave, Kentucky: Cave Research Foundation.