APA (7th ed.) Citation

Head,John G. (1989). The ages of earth: Great ice age. Cherrytree books.

Chicago Style (17th ed.) Citation

Head,John G. The Ages of Earth: Great Ice Age. Unknow: Cherrytree books, 1989.

MLA (9th ed.) Citation

Head,John G. The Ages of Earth: Great Ice Age. Cherrytree books, 1989.

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