Roberts, E. (1972). Viability of seeds. Chapman and Hall.
Lua i Stíl Chicago (17ú heag.)Roberts, E.H. Viability of Seeds. London: Chapman and Hall, 1972.
Lua MLA (9ú heag.)Roberts, E.H. Viability of Seeds. Chapman and Hall, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.