Cita APA (7th ed.)

Gilder, G. (1986). The spirit of enterprise. Penguin Books.

Cita Chicago (17th ed.)

Gilder, George. The Spirit of Enterprise. Harmondsworth, Middx. ; Ringwood, Vic.: Penguin Books, 1986.

Cita MLA (8th ed.)

Gilder, George. The Spirit of Enterprise. Penguin Books, 1986.