Sullivan, D. E., & Michael, N. (1986). Potash availability--market economy countries: A mineral availability appraisal. U.S. Dept. of the Interior, Bureau of Mines.
Lua i Stíl Chicago (17ú heag.)Sullivan, Daniel E., agus N. Michael. Potash Availability--market Economy Countries: A Mineral Availability Appraisal. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines, 1986.
Lua MLA (9ú heag.)Sullivan, Daniel E., agus N. Michael. Potash Availability--market Economy Countries: A Mineral Availability Appraisal. U.S. Dept. of the Interior, Bureau of Mines, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.