ICAO Annex 2
3.2.5 Operation on and in the vicinity of an aerodrome
An aircraft operated on or in the vicinity of an aerodrome shall, whether or not within an aerodrome traffic zone:

a) observe other aerodrome traffic for the purpose of avoiding collision;
b) conform with or avoid the pattern of traffic formed by other aircraft in operation;
c) make all turns to the left, when approaching for a landing and after taking off, unless otherwise instructed;
d) land and take off into the wind unless safety, the runway configuration, or air traffic considerations determine that a different direction is preferable.