Here is a list of definite, probable and possible souces for 1 Henry IV:
- The Chronicles of England, Scotland and Ireland by Raphael Holinshed
- A Myrroure for Magistrates
- The First Fowre Bookes of the Civile Wars by Samuel Daniel
- The Chronicles of England by John Stow
- Sir John Fastolf of Nacton
- A New Enterlude called Thersytes, Anonymous
- Endimion by John Lyly
- The Nature of the Four Elements by John Rastell
- The World and the Child, Anonymous