Trans Women Sing: Vocal Resources
(Read the story here.)
Links to a few transfeminine voice training resources:
Some basics from The New York Speech & Voice Lab.
http://www.nyspeechandvoicelab.net/transgender/voice-feminization/
In greater detail, from Kathe Perez, with links to further resources.
http://www.exceptionalvoice.com/home/voice-feminization/ (scroll down)
http://www.askkatheperez.com/how-to-sound-feminine-one-step-at-a-time-step-11-november-fluency/
There are dozens, perhaps hundreds of transfeminine speech tutorial videos on YouTube.
https://www.youtube.com/results?search_query=transfeminine+voice
For development of the modal-falsetto passaggio — these articles are directed at male singers, but the mechanics are the same.
http://www.musicedted.info/SingingBetter/Vocal_Quality_%26_Registers.html
http://www.musicedted.info/SingingBetter/Falsetto.html
http://www.musicedted.info/SingingBetter/Sotto_Voce_%26_Passaggio.html
Singing into the mask.
https://music.knoji.com/mask-singing-the-best-method-of-vocal-practice/
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