The important RFCs and Internet Drafts relating to FTP are:

	rfc959		The core standard.
	rfc1123		Various clarifications and requirements.
	rfc2389		Feature negotiation.
	rfc2428		FTP extensions for IPv6 and NATs.
	rfc2577		FTP security considerations.
	rfc2640		Internationalization of the protocol.
	draft-ietf-ftpext-mlst-11.txt	Proposed extensions.

Other references of interest:

	http://cr.yp.to/ftp/security.html