PS:AKH: Plane Shift Amonkhet, Races of Amonkhet at p. PS:KLD: Plane Shift: Kaladesh, Races of Kaladesh at p. PS:INN: Plane Shift: Innistrad, Life on Innistrad at p. PS:ZEN: Plane Shift: Zendikar, Races of Zendikar at p. PotA: Princes of the Apocalypse, Appendix A: Genasi OGA: One Grung Above, an Extra Life fundraiser from WotC LR: Locathah Rising, an Extra Life fundraiser from WotC MOoT: Mythic Odesseys of Theros, Chapter 1 > Races
MToF: Mordenkainen's Tome of Foes, throughout Chapters 1-5 72-74ĮE: Elemental Evil Player's Companion, Chapter 1: Races 285-287ĪI: Acquisitions Incorporated, 'New Race: Verdan' at p. 3-7ĭMG: Dungeon Master's Guide, 'Creating New Character Options' at p. SRD: System Reference Document, 5e, 'Races' at p. Which one is relevant depends on why you're looking for an 'official' race.
There are two different ways a race could be 'official': it could be 'official' in the sense of fully-tested and legal for sanctioned organized play campaigns, and it could be 'official' in the sense of being published in 1st-party material from Wizards of the Coast.
