APA (7th ed.) Citation

Briggs, O. M., & Ivanowski, S. d. (2007). The Black Cross. Project Gutenberg.

Chicago Style (17th ed.) Citation

Briggs, Olive M., and Sigismond de Ivanowski. The Black Cross. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Briggs, Olive M., and Sigismond de Ivanowski. The Black Cross. Project Gutenberg, 2007.

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