Gaya APA

ICAO, . (1953). CIRCULAR 29-AN/25 SPECIFICATIONS ADOPTED BY AGENCIES OF THE UNITED STATES GOVERMENT FOR THE PRODUCTION OF ROUTE CHARTS OF THE WORLD SCALE 1 : 2.000.000 . Canada: ICAO.

Gaya MLA

ICAO, . "CIRCULAR 29-AN/25 SPECIFICATIONS ADOPTED BY AGENCIES OF THE UNITED STATES GOVERMENT FOR THE PRODUCTION OF ROUTE CHARTS OF THE WORLD SCALE 1 : 2.000.000". Canada: ICAO, 1953. Text.