Procedure for Chalitzah
Please note that "Chalitzah" refers to the rite which frees a man and woman from their obligation to perform levirate marriage.
Links
Is there a financial penalty [אגרת מרד] for a woman or man who refuses yibbum or chalitzah: Ketuvot 64a
Source for the idea that chalitzah should result in a woman's being permitted to marry anyone: Kiddushin 14a
Requiring mental competence: Yevamot 104b, 106a
Conditional Chalitzah: Rashi Yevamot 106a
Sending a proxy for Chalitzah: Rashi Yevamot 106a; Ketuvot 74a
Importance of the order of events: Yevamot 105a, 106b
Standing: Moed Katan 21a
Attendees Should Announce "Chalutz HaNaal [The Shoe is Removed]": Yevamot 101b, 106b