What is the difference between " he was killed" and "he had been killed"?

Usagevoice of asked May 06 '13 at 08:35 isaac New member

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Could you explaine how to reference this in reference list by using APA style, 
Jeffrey M. Brunstrom, Jeremy F. Burn, Nicola R. Sell, Jane M. Collingwood, Peter
J. Rogers, Laura L. Wilkinson, Elanor C. Hinton, Olivia M. Maynard, and Danielle Ferriday
(2012) Episodic Memory and Appetite Regulation in Humans. PLoS ONE 7(12): e50707.
doi:10.1371/journal.pone.0050707 (access at:  

link comment answered May 07 '13 at 02:01 yordanos DAGNE New member

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