Cita APA (7a ed.)

Kelty, C. M. (2008). Two bits: The cultural significance of free software. Duke University Press.

Cita Chicago Style (17a ed.)

Kelty, Christopher M. Two Bits: The Cultural Significance of Free Software. Durham: Duke University Press, 2008.

Cita MLA (8a ed.)

Kelty, Christopher M. Two Bits: The Cultural Significance of Free Software. Duke University Press, 2008.