youversion://bible?reference=&version= (version is optional)
For the reference code, you would use exactly what appears on the website. So:
Website shows: ...ps.83.niv84 you would use
youversion://bible?reference=ps.83&version=niv84 (and the version would be optional. If you don't include it it should default to what the user last used).
Here are some additional ones that you can use:
* reading_plans?category= (category optional)
* reading_plan_detail?id=
* reading_plan_day?id=&day=
* reading_plan_read?id=&day=&position= (position is zero-indexed, meaning 0 is first reading, 1 is second, etc;
* versions?version=
* note?id=
* live_event?id=