Cita APA (7th ed.)
Greenhalgh, T., & Shaw, D. (1994). Environment today. Longman.
Cita Chicago (17th ed.)
Greenhalgh, Trisha, i David Shaw. Environment Today. England: Longman, 1994.
Cita MLA (9th ed.)
Greenhalgh, Trisha, i David Shaw. Environment Today. Longman, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.