Berry, B. J. L. (1968). Economic regionalization and numerical methods: Final report of the Commission on Methods of Economic Regionalization of the International Geographical Union. Państowe Wydawn. Naukowe.
Chicago-Zitierstil (17. Ausg.)Berry, Brian Joe Lobley. Economic Regionalization and Numerical Methods: Final Report of the Commission on Methods of Economic Regionalization of the International Geographical Union. Warszawa: Państowe Wydawn. Naukowe, 1968.
MLA-Zitierstil (9. Ausg.)Berry, Brian Joe Lobley. Economic Regionalization and Numerical Methods: Final Report of the Commission on Methods of Economic Regionalization of the International Geographical Union. Państowe Wydawn. Naukowe, 1968.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.