Gaya APA

ICAO, . (1956). CIRCULAR 26-AN/23 TERRAIN CLEARANCE AND VERTICAL SEPARATION OF AIRCRAFT (SECOND EDITION). Canada: ICAO.

Gaya MLA

ICAO, . "CIRCULAR 26-AN/23 TERRAIN CLEARANCE AND VERTICAL SEPARATION OF AIRCRAFT". SECOND EDITION Canada: ICAO, 1956. Text.