APA aipamena

Okoń, W., & Wilgocka-Okoń, B. (1973). The school readiness project. United Nations Educational Scientific and Cultural Organization.

Chicago Style aipamena

Okoń, Wincenty, and Barbara Wilgocka-Okoń. The School Readiness Project. Paris: United Nations Educational Scientific and Cultural Organization, 1973.

MLA aipamena

Okoń, Wincenty, and Barbara Wilgocka-Okoń. The School Readiness Project. United Nations Educational Scientific and Cultural Organization, 1973.