The author's complete entry in the reference list counts as part of the alphabetical order, so Huang, J will come before Huang, TL, as "J" comes before "T", alphabetically.
If the authors' names were completely identical (or it is the same author), then you move to the next author in the list. Whoever is alphabetically superior goes first.
And "nothing" comes before "something", so Huang, TL with no second author would come before Huang, TL & Randal, M.
This rule is the same for all Harvard-based styles, including APA.
We acknowledge the Australian Aboriginal and Torres Strait Islander peoples as the first inhabitants of the nation and acknowledge Traditional Owners of the lands where our staff and students, live, learn and work.
