APA (7e ed.) Bronvermelding

Welch, W. W. (1971). A summary of research in science education for the years of 1968-69 secondary school level. ERIC.

Chicago (17e ed.) Bronvermelding

Welch, Wayne W. A Summary of Research in Science Education for the Years of 1968-69 Secondary School Level. Ohio, Estados Unidos: ERIC, 1971.

MLA (9e ed.) Bronvermelding

Welch, Wayne W. A Summary of Research in Science Education for the Years of 1968-69 Secondary School Level. ERIC, 1971.