APA aipamena

Ragass, . J. F., & Thomas, L. B. (1990). Principles of economics. Huscourt Brau Jovanavich Publishers.

Chicago Style aipamena

Ragass, James F., and Lloyd B. Thomas. Principles of Economics. San Diego: Huscourt Brau Jovanavich Publishers, 1990.

MLA aipamena

Ragass, James F., and Lloyd B. Thomas. Principles of Economics. Huscourt Brau Jovanavich Publishers, 1990.