(1989). Information Please Almanac Atlas & Yearbook 1989. Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Information Please Almanac Atlas & Yearbook 1989. Houghton Mifflin, 1989.
Lua MLA (8ú heag.)Information Please Almanac Atlas & Yearbook 1989. Houghton Mifflin, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.