Gaya APA

Karreman, H, F. (1961). Methods for improving world transportation accounts, applied to 1950 1953 (1961). : NY :National Bureau for Economic Rsearch,.

Gaya MLA

Karreman, Heman, F. "Methods for improving world transportation accounts, applied to 1950 1953". 1961 : NY :National Bureau for Economic Rsearch,, 1961. Text.