<center>For lessons on the [[topic]] of the '''''Heart''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Heart this link].</center>
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<center>For lessons on the [[topic]] of the '''''Heart''''', follow [https://nordan.daynal.org/wiki/index.php?title=Category:Heart this link].</center>
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==References==
==References==
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*[http://www.slate.com/id/2159800/?GT1=9129 The Shape of My Heart: Where did the ubiquitous Valentine's symbol come from?] by Keelin McDonell, [[Slate (magazine)|Slate.com]].
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*[https://www.slate.com/id/2159800/?GT1=9129 The Shape of My Heart: Where did the ubiquitous Valentine's symbol come from?] by Keelin McDonell, [[Slate (magazine)|Slate.com]].
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*[http://www.heartsymbol.com www.heartsymbol.com: The Heart Symbol - Origin, History And Significance] by Prof. [[Armin Dietz]]
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*[https://www.heartsymbol.com www.heartsymbol.com: The Heart Symbol - Origin, History And Significance] by Prof. [[Armin Dietz]]
*The shape of the heart, by Pierre Vinken, Amsterdam 2000.
*The shape of the heart, by Pierre Vinken, Amsterdam 2000.
*How the heart was held in medieval art, by Pierre Vinken, The Lancet, 358, 22, december 2001, 2155-2157.
*How the heart was held in medieval art, by Pierre Vinken, The Lancet, 358, 22, december 2001, 2155-2157.