APA
Research Centre for Economic & Statistical Studies of the Central Statistical Office, .Research Bulletin. Warsaw: Statistical Publishing Establishment.
Chicago
Research Centre for Economic & Statistical Studies of the Central Statistical Office, .Research Bulletin. Warsaw: Statistical Publishing Establishment.
Harvard
Research Centre for Economic & Statistical Studies of the Central Statistical Office, .Research Bulletin. Warsaw: Statistical Publishing Establishment.
MLA
Research Centre for Economic & Statistical Studies of the Central Statistical Office, .Warsaw: Statistical Publishing Establishment. .
