APA
Friedl A. E., . (2004). Teaching science to children : an inquiry approach. 6th ed. : McGraw-Hill Humanities/Social Sciences/Languages.
Chicago
Friedl Alfred E, . 2004. Teaching science to children : an inquiry approach. 6th ed. : McGraw-Hill Humanities/Social Sciences/Languages.
Harvard
Friedl A. E., . (2004). Teaching science to children : an inquiry approach. 6th ed. : McGraw-Hill Humanities/Social Sciences/Languages.
MLA
Friedl Alfred E, . Teaching science to children : an inquiry approach. 6th ed. : McGraw-Hill Humanities/Social Sciences/Languages. 2004.