APA (7th ed.) Citation

Lagerlöf, S., & Flach, P. B. (2004). Invisible Links. Project Gutenberg.

Chicago Style (17th ed.) Citation

Lagerlöf, Selma, and Pauline Bancroft Flach. Invisible Links. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Lagerlöf, Selma, and Pauline Bancroft Flach. Invisible Links. Project Gutenberg, 2004.

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