APA (7th ed.) Citation

HELMLER. (1969). Focus on physical science. Charles E. Merrill.

Chicago Style (17th ed.) Citation

HELMLER. Focus on Physical Science. Ohio: Charles E. Merrill, 1969.

MLA (8th ed.) Citation

HELMLER. Focus on Physical Science. Charles E. Merrill, 1969.

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