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Portions of the above article were adapted from the following sources under the [[GNU Free Documentation License]], under other applicable licenses, or by permission of the copyright holders.
Portions of the above article were adapted from the following sources under the [[GNU Free Documentation License]], under other applicable licenses, or by permission of the copyright holders.
* [http://planetmath.org/encyclopedia/LogicalImplication.html "Logical implication"], [http://planetmath.org/ PlanetMath].
* [http://www.getwiki.net/-Logical_Implication "Logical implication"], [http://www.getwiki.net/ GetWiki].
* [http://www.getwiki.net/-Logical_Implication "Logical implication"], [http://www.getwiki.net/ GetWiki].