APA (7th ed.) Citation

Beard, R. D. (2015). Rockhounding Delaware, Maryland, and the Washington, DC metro area: A guide to the areas' best rockhounding sites. FalconGuides.

Chicago Style (17th ed.) Citation

Beard, Robert D. Rockhounding Delaware, Maryland, and the Washington, DC Metro Area: A Guide to the Areas' Best Rockhounding Sites. Guilford, Connecticut ; Helena, Montana: FalconGuides, 2015.

MLA (9th ed.) Citation

Beard, Robert D. Rockhounding Delaware, Maryland, and the Washington, DC Metro Area: A Guide to the Areas' Best Rockhounding Sites. FalconGuides, 2015.