Cita APA (7a ed.)

Bull, I., & Winter, F. (1991). Community differences in business births and business growths. [s.n.].

Cita Chicago Style (17a ed.)

Bull, Ivan, y Frederick Winter. Community Differences in Business Births and Business Growths. [S.l.]: [s.n.], 1991.

Cita MLA (9a ed.)

Bull, Ivan, y Frederick Winter. Community Differences in Business Births and Business Growths. [s.n.], 1991.