Gaya APA
ICAO, .
(1983).
AIRPORT SERVICE MANUAL PART 6 CONTROL OF OBSTACLES DOC 9137-AN/898
.
Canada:
ICAO.
Gaya MLA
ICAO, .
"AIRPORT SERVICE MANUAL PART 6 CONTROL OF OBSTACLES DOC 9137-AN/898".
Canada:
ICAO,
1983.
Text.