Tohutoro APA (7th ed.)

Hatfield, N. J. (1978). Basic market, research techniques for transit systems. U.S. Department of Commerce.

Tohutoru Kātū Chicago (17th ed.)

Hatfield, Nancy J. Basic Market, Research Techniques for Transit Systems. Austin: U.S. Department of Commerce, 1978.

Tohutoro MLA (9th ed.)

Hatfield, Nancy J. Basic Market, Research Techniques for Transit Systems. U.S. Department of Commerce, 1978.