The Dangers of Choking. [w:] TeenWire.com by Planned Parenthood® Federation of America [on-line]. 2006-06-20. [dostęp 2007-08-09]. [zarchiwizowane z tego adresu (2007-07-09)].
web.archive.org
The Dangers of Choking. [w:] TeenWire.com by Planned Parenthood® Federation of America [on-line]. 2006-06-20. [dostęp 2007-08-09]. [zarchiwizowane z tego adresu (2007-07-09)].