APA (7th ed.) Citation

Pfeiffer, I., & Bergmann, F. G. (1999). Visit to Iceland and the Scandinavian North. Project Gutenberg.

Chicago Style (17th ed.) Citation

Pfeiffer, Ida, and Frédéric Guillaume Bergmann. Visit to Iceland and the Scandinavian North. Project Gutenberg, 1999.

MLA (9th ed.) Citation

Pfeiffer, Ida, and Frédéric Guillaume Bergmann. Visit to Iceland and the Scandinavian North. Project Gutenberg, 1999.

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