APA (7th ed.) Citation

Perkins, L. F. (2006). The Spartan Twins. Project Gutenberg.

Chicago Style (17th ed.) Citation

Perkins, Lucy Fitch. The Spartan Twins. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Perkins, Lucy Fitch. The Spartan Twins. Project Gutenberg, 2006.

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