Game.GetPlayer().AddItem(Alias_YourAliasName.GetReference(), 1)

Game.GetPlayer().AddItem(YourReferencePropertyHere.GetReference(), 1)
Player.AddItem(MyAlias)
PlayerREF.AddItem(MyAlias.GetReference())Won't work w/o http://www.creationkit.com/GetReference_-_ReferenceAlias.