Campbell, R. M. (1971). Studies on the distribution and productivity of submerged fresh-water macrophytes.
Lua i Stíl Chicago (17ú heag.)Campbell, Robert M. Studies on the Distribution and Productivity of Submerged Fresh-water Macrophytes. 1971.
Lua MLA (8ú heag.)Campbell, Robert M. Studies on the Distribution and Productivity of Submerged Fresh-water Macrophytes. 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.