APA (7th ed.) Citation

Tilden, F. (1960). The fifth essence: An invitation to share in our eternal heritage. National Park Trust Fund Board.

Chicago Style (17th ed.) Citation

Tilden, Freeman. The Fifth Essence: An Invitation to Share in Our Eternal Heritage. Washington, D.C.: National Park Trust Fund Board, 1960.

MLA (9th ed.) Citation

Tilden, Freeman. The Fifth Essence: An Invitation to Share in Our Eternal Heritage. National Park Trust Fund Board, 1960.