Basic Instrument Rating (BIR) - Rules published - EASA
Instrument Rating - AOPA
EASA BIR Basic Instrument Rating - Patrick Lienhart
Fundamental Instrument Maneuvers - My CFI Book
Instrument Rating - The Flight Academy
IFR Series - AOPA
On Instruments: Basic attitude flying - AOPA
EASA CB IR Instrument Rating Course - Patrick Lienhart
7 Things to Expect During IFR Training - FLYING Magazine
IFR Proficiency Series: Instrument Flying Training - PilotWorkshops