APA (7th ed.) Citation

Kaku Michio. (2006). Parallel Worlds. Penguin Books.

Chicago Style (17th ed.) Citation

Kaku Michio. Parallel Worlds. london: Penguin Books, 2006.

MLA (9th ed.) Citation

Kaku Michio. Parallel Worlds. Penguin Books, 2006.

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