APA (7th ed.) Citation

Farrag, I. I. (1979). The use and validation of a nonverbal slide test for measuring attainment of relational concepts in physics by Egyptian students. [publisher not identified].

Chicago Style (17th ed.) Citation

Farrag, Ibrahim Ismail. The Use and Validation of a Nonverbal Slide Test for Measuring Attainment of Relational Concepts in Physics by Egyptian Students. [Place of publication not identified]: [publisher not identified], 1979.

MLA (9th ed.) Citation

Farrag, Ibrahim Ismail. The Use and Validation of a Nonverbal Slide Test for Measuring Attainment of Relational Concepts in Physics by Egyptian Students. [publisher not identified], 1979.