APA (7th ed.) Citation

Rønning, N. N. (1938). Fifty years in America. Friends Publishing Company.

Chicago Style (17th ed.) Citation

Rønning, N. N. Fifty Years in America. Minneapolis, Minn.: Friends Publishing Company, 1938.

MLA (9th ed.) Citation

Rønning, N. N. Fifty Years in America. Friends Publishing Company, 1938.