APA (7th ed.) Citation

Atholl, K. M. S. (1938). Searchlight on Spain. Penguin Books.

Chicago Style (17th ed.) Citation

Atholl, Katharine Marjory Stewart-Murray. Searchlight on Spain. Harmondsworth [etc.]: Penguin Books, 1938.

MLA (9th ed.) Citation

Atholl, Katharine Marjory Stewart-Murray. Searchlight on Spain. Penguin Books, 1938.