Gaya APA

Friedl, A, E. et al (). Modern Physical Science: Exercises and Investigations (Cet. 1). NEW YORK: Holt Rinehart and Winston.

Gaya MLA

Friedl, Alfred, E.. et al. "Modern Physical Science: Exercises and Investigations". Cet. 1 NEW YORK: Holt Rinehart and Winston, . Text.