Heart to Heart Japanese Album Cover, Accessed October 28, 2012, http://k2nblog.com/single-4minute-heart-to-heart-japanese-version/
Cataloged by: Kaetrena Davis Kendrick.
Heart to Heart Album Cover, Accessed October 28, 2012, http://www.dkpopnews.net/2011/03/video-4-minutes-heart-to-heart-mv.html
Cataloged by: Kaetrena Davis Kendrick.