I have a pump family tree 

Dynamic——centrifugal —— vertical, horizontal , single stage, and multistage 
Dynamic —- axial 
Positive displacement —— rotary—— screw pump,external gear, internal gear, sliding vane, flexible vane , lobe pump 
Positive displacement —— reciprocating—— piston , plunger , diaphragm 
I need a research paper on this can’t use Wikipedia has to be reputable sources 6000words single spaced apa format 

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