APA (7th ed.) Citation

Wren, D. (1948). They enriched humanity: Adventures of the 19th century. Skilton.

Chicago Style (17th ed.) Citation

Wren, David. They Enriched Humanity: Adventures of the 19th Century. London: Skilton, 1948.

MLA (9th ed.) Citation

Wren, David. They Enriched Humanity: Adventures of the 19th Century. Skilton, 1948.