APA (7th ed.) Zitazioa

engert, m. (1964). classification of industries in social countries. the institute of national planning.

Chicago Style (17th ed.) Zitazioa

engert, manfred. Classification of Industries in Social Countries. cairo: the institute of national planning, 1964.

MLA (9th ed.) Zitazioa

engert, manfred. Classification of Industries in Social Countries. the institute of national planning, 1964.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.