APA aipamena

(1989). Information Please Almanac Atlas & Yearbook 1989. Houghton Mifflin.

Chicago Style aipamena

Information Please Almanac Atlas & Yearbook 1989. Houghton Mifflin, 1989.

MLA aipamena

Information Please Almanac Atlas & Yearbook 1989. Houghton Mifflin, 1989.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.