An analysis of General Assembly voting can be found in the Repertory of Practice of UN Organs by consulting the section relating to Article 18.
The majority of General Assembly resolutions are adopted without a vote.
If a vote is taken, it can be documented in two ways:
Voting in General Assembly Main Committees
Committee voting information can be found in the meeting records of the Committees as well as in the reports which the Committees submit to the plenary on each agenda item allocated to them. See UN Documentation: General Assembly: Main Committees research guide for additional information.
There are multiple sources to find General Assembly voting information, including: