APA (7th ed.) Citation

Tanko, B. d., & Guerney, B. G. (1931). The world's orphan. Elf Publishers.

Chicago Style (17th ed.) Citation

Tanko, Boris de, and Bernard Guilbert Guerney. The World's Orphan. New York: Elf Publishers, 1931.

MLA (9th ed.) Citation

Tanko, Boris de, and Bernard Guilbert Guerney. The World's Orphan. Elf Publishers, 1931.