Latest issue available via Internet from the IRS web site. Address as of 6/10/2004: http://www.irs.gov/pub/irs-pdf/p527.pdf ; current access is available via PURL.
Also available as part of CD-ROM (through 2000): United States. Internal Revenue Service. Federal tax forms.
Available also on CD-ROM: United States. Internal Revenue Service. Tax products CD-ROM.