Cita APA (7a ed.)

Barnes, W. N. (1980). International marketing indicators. [s.n.].

Cita Chicago Style (17a ed.)

Barnes, W. N. International Marketing Indicators. [S.l.]: [s.n.], 1980.

Cita MLA (9a ed.)

Barnes, W. N. International Marketing Indicators. [s.n.], 1980.