APA (7th ed.) Citation

Clark, S. K. M. (1967). Leonardo da Vinci: An account of his development as an artist. Penguin Books.

Chicago Style (17th ed.) Citation

Clark, Sir Kenneth McKenzie. Leonardo Da Vinci: An Account of His Development as an Artist. Baltimore: Penguin Books, 1967.

MLA (9th ed.) Citation

Clark, Sir Kenneth McKenzie. Leonardo Da Vinci: An Account of His Development as an Artist. Penguin Books, 1967.