APA (7th ed.) Citation

Protheroe, W. (1981). Exploring the universe. Charles E. Merrill.

Chicago Style (17th ed.) Citation

Protheroe, W.M. Exploring the Universe. Columbus: Charles E. Merrill, 1981.

MLA (9th ed.) Citation

Protheroe, W.M. Exploring the Universe. Charles E. Merrill, 1981.

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