APA (7th ed.) Citation

Smith, A. D., & Samuel, H. (2010). The Development of Rates of Postage An Historical and Analytical Study. Project Gutenberg.

Chicago Style (17th ed.) Citation

Smith, A. D., and Herbert Samuel. The Development of Rates of Postage An Historical and Analytical Study. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Smith, A. D., and Herbert Samuel. The Development of Rates of Postage An Historical and Analytical Study. Project Gutenberg, 2010.

Warning: These citations may not always be 100% accurate.