Oku, Hanako (December 30, 2009). "Thank you 2009!". Hanako Oku's Personal Blog (in Japanese). Retrieved January 10, 2010.
Oku, Hanako (January 7, 2010). "CM to the mast!". Hanako Oku's Personal Blog (in Japanese). Retrieved January 10, 2010.
Oku, Hanako (May 4, 2009). "Birthday". Hanako Oku's Personal Blog (in Japanese). Retrieved May 7, 2009.
Oku, Hanako (December 26, 2009). "Merry Christmas?!". Hanako Oku's Personal Blog (in Japanese). Retrieved February 16, 2010. 10th single First Love is sale schedule on 2010 March 17th!
livedoor.jp
blog.livedoor.jp
Oku, Hanako; bayfm78 staff. "KameKameHouse Blog" (in Japanese). Retrieved March 19, 2009.{{cite web}}: CS1 maint: numeric names: authors list (link)
okuhanako.com
Oku, Hanako; Pony Canyon staff. "Biography" (in Japanese). Archived from the original on October 11, 2015. Retrieved March 19, 2009.
web.archive.org
Oku, Hanako; Pony Canyon staff. "Biography" (in Japanese). Archived from the original on October 11, 2015. Retrieved March 19, 2009.
Lau, Stephen (June 11, 2007). "hanako oku". That's Whacked. Archived from the original on October 25, 2008. Retrieved March 19, 2009.
whacked.net
Lau, Stephen (June 11, 2007). "hanako oku". That's Whacked. Archived from the original on October 25, 2008. Retrieved March 19, 2009.
