BULLIS, L. H., & MIELKE, J. E. (1985). Strategic and critical materials. Westview Press.
Lua i Stíl Chicago (17ú heag.)BULLIS, L. Harold, agus James E. MIELKE. Strategic and Critical Materials. Boulder: Westview Press, 1985.
Lua MLA (9ú heag.)BULLIS, L. Harold, agus James E. MIELKE. Strategic and Critical Materials. Westview Press, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.