Cita APA

Smith, D. L., & Gill, K. (2015). Parks directory of the United States. Omnigraphics.

Chicago Style Citation

Smith, Darren L., i Kay Gill. Parks Directory of the United States. Omnigraphics, 2015.

Cita MLA

Smith, Darren L., i Kay Gill. Parks Directory of the United States. Omnigraphics, 2015.

Atenció: Aquestes cites poden no estar 100% correctes.