APA (7th ed.) Citation

Verne, J., & Schwach, H. J. (1990). A journey to the center of the earth. Penguin Group.

Chicago Style (17th ed.) Citation

Verne, Jules, and Howard J. Schwach. A Journey to the Center of the Earth. New York: Penguin Group, 1990.

MLA (9th ed.) Citation

Verne, Jules, and Howard J. Schwach. A Journey to the Center of the Earth. Penguin Group, 1990.