Cita APA (7a ed.)

Reed, R., & DeFillippi, R. J. (1990). Causal ambiguity, barriers to imitation and sustainable competitive advantage. [s.n.].

Cita Chicago Style (17a ed.)

Reed, Richard, y Robert J. DeFillippi. Causal Ambiguity, Barriers to Imitation and Sustainable Competitive Advantage. [S.l.]: [s.n.], 1990.

Cita MLA (9a ed.)

Reed, Richard, y Robert J. DeFillippi. Causal Ambiguity, Barriers to Imitation and Sustainable Competitive Advantage. [s.n.], 1990.