First ever IFR flight by Lt James Doolittle LINK
The most up-to-date best Australian IFR guide is by Benjamin Montgomery-Schinkel LINK
PilotsCafe IFR Cheat Sheet LINK
AOPA Guide to Single Pilot IFR operations LINK
Calculated Risk - the extraordinary life of Lt James Doolittle LINK [Kindle book]
Instrument Ratings - Civil Aviation Safety Authority CASA LINK
The Private Pilot Instrument Rating Guide Chris Markham LINK