How to abbreviate Pen Down?

The ways to abbreviate Pen Down.

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Pen Down
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APASmart Define. (2017). Pen Down. Retrieved April 20, 2018, from http://smartdefine.org/pen_down/abbreviations/a
ChicagoSmart Define. 2017. "Pen Down" http://smartdefine.org/pen_down/abbreviations/a (accessed April 20, 2018).
HarvardSmart Define 2017, Pen Down, Smart Define, viewed 20 April, 2018, <http://smartdefine.org/pen_down/abbreviations/a>.
MLASmart Define. "Pen Down" 16 June 2017. Web. 20 April 2018. <http://smartdefine.org/pen_down/abbreviations/a>