Kou Yaginuma “Twin Spica, Vol. 4? (Futatsu no Supika) Vertical, Inc. 2002 (2010) ISBN13: 978-1-934-28790-3 Publisher’s Web Site
URL: http://www.outofthecradle.net/archives/2010/11/%e2%80%9ctwin-spica-vol-4%e2%80%b3-manga/
Kou Yaginuma “Twin Spica, Vol. 4? (Futatsu no Supika) Vertical, Inc. 2002 (2010) ISBN13: 978-1-934-28790-3 Publisher’s Web Site
URL: http://www.outofthecradle.net/archives/2010/11/%e2%80%9ctwin-spica-vol-4%e2%80%b3-manga/