Freysen, A. H. J. (1978). Structure and functioning of plant populations. North-Holland Publishing.
Lua i Stíl Chicago (17ú heag.)Freysen, A. H. J. Structure and Functioning of Plant Populations. Amsterdam: North-Holland Publishing, 1978.
Lua MLA (9ú heag.)Freysen, A. H. J. Structure and Functioning of Plant Populations. North-Holland Publishing, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.