APA (7th ed.) Citation

Halsey, R. I., & Bickford, N. F. (2011). Blue Robin, the Girl Pioneer. Project Gutenberg.

Chicago Style (17th ed.) Citation

Halsey, Rena I., and Nana French Bickford. Blue Robin, the Girl Pioneer. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Halsey, Rena I., and Nana French Bickford. Blue Robin, the Girl Pioneer. Project Gutenberg, 2011.

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