APA (7th ed.) Citation

Francis, P. (1976). Volcanoes / (by) Peter Francis. Penguin.

Chicago Style (17th ed.) Citation

Francis, Peter. Volcanoes / (by) Peter Francis. Harmondsworth (etc.): Penguin, 1976.

MLA (9th ed.) Citation

Francis, Peter. Volcanoes / (by) Peter Francis. Penguin, 1976.

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