Cita APA (7a ed.)

Gilpin, E. A., & Pierce, J. P. (1999). Cigar smoking in California, 1990-1996. [s.n.].

Cita Chicago Style (17a ed.)

Gilpin, Elizabeth A., y John P. Pierce. Cigar Smoking in California, 1990-1996. [S.l.]: [s.n.], 1999.

Cita MLA (9a ed.)

Gilpin, Elizabeth A., y John P. Pierce. Cigar Smoking in California, 1990-1996. [s.n.], 1999.