APA (7th ed.) Citation

Zanelli, L. (1976). Subaqua swimming / (by) Leo Zanelli. Teach Yourself Books.

Chicago Style (17th ed.) Citation

Zanelli, Leo. Subaqua Swimming / (by) Leo Zanelli. London: Teach Yourself Books, 1976.

MLA (9th ed.) Citation

Zanelli, Leo. Subaqua Swimming / (by) Leo Zanelli. Teach Yourself Books, 1976.

Warning: These citations may not always be 100% accurate.