Ackland, D., & Freeburg, J. (1989). Insight guides: Texas /Diana Ackland and Jamie Freeburg. APA Pub.
Cita Chicago (17th ed.)Ackland, Diana, i Jamie Freeburg. Insight Guides: Texas /Diana Ackland and Jamie Freeburg. Singapore: APA Pub, 1989.
Cita MLA (9th ed.)Ackland, Diana, i Jamie Freeburg. Insight Guides: Texas /Diana Ackland and Jamie Freeburg. APA Pub, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.