Welch, W. W. (1971). A summary of research in science education for the years of 1968-69 secondary school level. ERIC.
Цитирование в стиле Чикаго (17-е изд.)Welch, Wayne W. A Summary of Research in Science Education for the Years of 1968-69 Secondary School Level. Ohio, Estados Unidos: ERIC, 1971.
Цитирование MLA (9-е изд.)Welch, Wayne W. A Summary of Research in Science Education for the Years of 1968-69 Secondary School Level. ERIC, 1971.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.