https://books.google.ro/books?id=_LPr-V7TES0C&pg=PA121&dq=describes+the+main+operating+features+of+centrifugal+pumps&hl=en&sa=X&ei=9KU3Vf7QDsXYaqb-gZAH&redir_esc=y#v=onepage&q=describes%20the%20main%20operating%20features%20of%20centrifugal%20pumps&f=false

https://books.google.ro/books?id=OYxacAomY8wC&printsec=frontcover&dq=Centrifugal+Pump+Design&hl=en&sa=X&ei=Y8U9VdTOJIKAaZ6-gLAM&ved=0CDIQ6AEwAA#v=onepage&q=Centrifugal%20Pump%20Design&f=false

https://books.google.ro/books?id=vKghr_uQFZUC&pg=PA12&dq=centrifugal+pump+oil+tankers&hl=en&sa=X&ei=3bs9Vc7NLIbbat_PgJAE&ved=0CFoQ6AEwBw#v=onepage&q=centrifugal%20pump%20oil%20tankers&f=false

https://books.google.ro/books?id=_DlddukbydwC&pg=PA255&dq=centrifugal+pump+oil+tankers&hl=en&sa=X&ei=3bs9Vc7NLIbbat_PgJAE&ved=0CEsQ6AEwBA#v=onepage&q=centrifugal%20pump%20oil%20tankers&f=false

http://e-marineeducation.com/en/cops-cargo-oil-pumps-used-oil-tankers/

https://books.google.ro/books?id=mFm0BQAAQBAJ&pg=PA332&dq=centrifugal+pump+oil+tankers&hl=en&sa=X&ei=3bs9Vc7NLIbbat_PgJAE&ved=0CDEQ6AEwAA#v=onepage&q=centrifugal%20pump%20oil%20tankers&f=false

http://www.plant-maintenance.com/articles/centrifugalpumps.pdf

http://www.pumpfundamentals.com/images/tutorial/tutorial.pdf

http://www.marineinsight.com/tech/auxiliary-machinery/general-overview-of-types-of-pumps-on-ship/

http://www.marinersgalaxy.com/2013/01/what-is-centrifugal-pump.html

http://www.enggpedia.com/mechanical-engineering-encyclopedia/dictionary/hydraulics/1691-pumps

http://en.wikipedia.org/wiki/Hydraulic_head