PATRICK HANKS, KATE HARDCASTLE, and FLAVIA HODGES. "Valentin." A Dictionary of First Names. Oxford University Press. 2006. Encyclopedia.com. 22 Dec. 2009 <http://www.encyclopedia.com>.
PATRICK HANKS, KATE HARDCASTLE, and FLAVIA HODGES. "Valentin." A Dictionary of First Names. Oxford University Press. 2006. Encyclopedia.com. (December 22, 2009). http://www.encyclopedia.com/doc/1O41-Valentin2.html
PATRICK HANKS, KATE HARDCASTLE, and FLAVIA HODGES. "Valentin." A Dictionary of First Names. Oxford University Press. 2006. Retrieved December 22, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O41-Valentin2.html