"pool, 2, noun, 2". OxfordDictionaries.com. British and World English. Oxford University Press. 2016. Archived from the original on 24 July 2012. Retrieved 15 July 2016.
"pool, 2, noun, 2". OxfordDictionaries.com. British and World English. Oxford University Press. 2016. Archived from the original on 24 July 2012. Retrieved 15 July 2016.
Varner, Nick (February 2008). "Killing Me Softly? The Outbreak of the Soft Break Threatens the Game of 9-ball". Billiards Digest. Vol. 30, no. 3. Chicago: Luby Publishing. pp. 4–35. ISSN0164-761X.
Panozzo, Mike (February 2008). "Long Live the Cup!". Billiards Digest. Vol. 30, no. 3. Chicago: Luby Publishing. pp. 34–35. ISSN0164-761X.