Cita APA

Weingardt, R. G. (2009). Circles in the sky: The life and times of George Ferris. Estados Unidos: American Society of Civil Engineers (ASCE Press).

Citación estilo Chicago

Weingardt, Richard G.. Circles in the Sky: The Life and Times of George Ferris. Estados Unidos: American Society of Civil Engineers (ASCE Press), 2009.

Cita MLA

Weingardt, Richard G.. Circles in the Sky: The Life and Times of George Ferris. Estados Unidos: American Society of Civil Engineers (ASCE Press), 2009.