Cita APA (7a ed.)

Walle, A. H. (1991). Should companies support causes: A strategic analysis. [s.n.].

Cita Chicago Style (17a ed.)

Walle, Alf H. Should Companies Support Causes: A Strategic Analysis. [S.l.]: [s.n.], 1991.

Cita MLA (9a ed.)

Walle, Alf H. Should Companies Support Causes: A Strategic Analysis. [s.n.], 1991.