Cita APA (7th ed.)

Geological Society of America & Legget, R. F. (1982). Geology under cities. Geological Society of America.

Cita Chicago (17th ed.)

Geological Society of America i Robert Ferguson Legget. Geology Under Cities. Boulder, Colo.: Geological Society of America, 1982.

Cita MLA (8th ed.)

Geological Society of America i Robert Ferguson Legget. Geology Under Cities. Geological Society of America, 1982.