Sund, R. B., & Trowbridge, L. (1963). Teaching science by inquiri in the secondary school. A. Bell r Howell Com.
Lua i Stíl Chicago (17ú heag.)Sund, Robert B., agus Leslie Trowbridge. Teaching Science by Inquiri in the Secondary School. A. Bell r Howell Com, 1963.
Lua MLA (8ú heag.)Sund, Robert B., agus Leslie Trowbridge. Teaching Science by Inquiri in the Secondary School. A. Bell r Howell Com, 1963.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.