TISDALE, S. L., & TISDALE, S. L. (1990). Soil Fertility And Fertilizers Samuel Tsidale, Werner L. Nelson, James D. Beaton. Macmillan Publishing.
Lua i Stíl Chicago (17ú heag.)TISDALE, Samuel L., agus Samuel L. TISDALE. Soil Fertility And Fertilizers Samuel Tsidale, Werner L. Nelson, James D. Beaton. Macmillan Publishing, 1990.
Lua MLA (8ú heag.)TISDALE, Samuel L., agus Samuel L. TISDALE. Soil Fertility And Fertilizers Samuel Tsidale, Werner L. Nelson, James D. Beaton. Macmillan Publishing, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.