Aircraft propulsion engines and its efficiencies - Engineering bibliographies - in Harvard style

In-text: (Gas Turbine Technology, 2007)

Your Bibliography: 2007. Gas Turbine Technology. [online] Available at: <http://www.rolls-royce.com/Images/gasturbines_tcm92-4977.pdf> [Accessed 6 February 2015].

In-text: (Benson, 2014)

Your Bibliography: Benson, T., 2014. Types of Gas Turbines. [online] Grc.nasa.gov. Available at: <http://www.grc.nasa.gov/WWW/k-12/airplane/trbtyp.html> [Accessed 6 February 2015].

In-text: (Cohen, Rogers and Saravanamuttoo, 1987)

Your Bibliography: Cohen, H., Rogers, G. and Saravanamuttoo, H., 1987. Gas turbine theory. Burnt Mill, Harlow, Essex, England: Longman Scientific & Technical.

In-text: (Farokhi, 2009)

Your Bibliography: Farokhi, S., 2009. Aircraft propulsion. Hoboken, NJ: John Wiley & Sons.

In-text: (Gonales, n.d.)

Your Bibliography: Gonales, J., n.d. Aircraft Engines. 1st ed. [ebook] SICARO.COM. Available at: <http://cosmos.ucdavis.edu/archives/2008/cluster3/gonzales.pdf> [Accessed 6 February 2015].

In-text: (Plahen, 2010)

Your Bibliography: Plahen, T., 2010. Types of Airplane Engines: The Power for Modern Aircraft. [online] Bright Hub. Available at: <http://www.brighthub.com/science/aviation/articles/81501.aspx> [Accessed 6 February 2015].