Cita APA (7th ed.)

(1992). Trends and Issues in Science Education Stanley L. Helgeson. [microform].

Cita Chicago (17th ed.)

Trends and Issues in Science Education Stanley L. Helgeson. [microform]. 1992.

Cita MLA (9th ed.)

Trends and Issues in Science Education Stanley L. Helgeson. [microform]. 1992.

Atenció: Aquestes cites poden no estar 100% correctes.