Lowrance, R., Hendrix, P. F., & Odum, E. P. (1987). A hierarchical approach to sustainable agriculture.
Lua i Stíl Chicago (17ú heag.)Lowrance, Richard, Paul F. Hendrix, agus Eugene P. Odum. A Hierarchical Approach to Sustainable Agriculture. 1987.
Lua MLA (9ú heag.)Lowrance, Richard, et al. A Hierarchical Approach to Sustainable Agriculture. 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.