Cita APA (7th ed.)

Frey, K. (1977). Research in science education in Europe: Perspectives, structural problems and documentation. Swets & Zeitlinger.

Cita Chicago (17th ed.)

Frey, Karl. Research in Science Education in Europe: Perspectives, Structural Problems and Documentation. Amsterdam: Swets & Zeitlinger, 1977.

Cita MLA (9th ed.)

Frey, Karl. Research in Science Education in Europe: Perspectives, Structural Problems and Documentation. Swets & Zeitlinger, 1977.