Some references I use:
1) Adam Chan
https://youtube.com/user/adamchan1
2) Chi Sau Club
https://youtube.com/c/ChiSauClub
3) John Coogan
https://youtube.com/c/SifuJohnCogan
4) Fight Science
https://youtube.com/c/londonwingchun
5) Shanghai Wing Chun
https://youtube.com/c/ShanghaiWingChun