Hydraulic Fracturing - Engineering bibliographies - in Harvard style

In-text: (Hydraulic Fracturing Q & A's, 2015)

Your Bibliography: Api.org. 2015. Hydraulic Fracturing Q & A's. [online] Available at: <http://www.api.org/oil-and-natural-gas-overview/exploration-and-production/hydraulic-fracturing/hydraulic-fracturing-qa.aspx> [Accessed 25 January 2015].

In-text: (Shale gas provides largest share of U.S. natural gas production in 2013 - Today in Energy - U.S. Energy Information Administration (EIA), 2014)

Your Bibliography: Eia.gov. 2014. Shale gas provides largest share of U.S. natural gas production in 2013 - Today in Energy - U.S. Energy Information Administration (EIA). [online] Available at: <http://www.eia.gov/todayinenergy/detail.cfm?id=18951> [Accessed 25 January 2015].

In-text: (U.S. Natural Gas Marketed Production (Million Cubic Feet), 2015)

Your Bibliography: Eia.gov. 2015. U.S. Natural Gas Marketed Production (Million Cubic Feet). [online] Available at: <http://www.eia.gov/dnav/ng/hist/n9050us2a.htm> [Accessed 25 January 2015].

In-text: (Just the Facts: What is Fracking?, 2015)

Your Bibliography: Energyindepth.org. 2015. Just the Facts: What is Fracking?. [online] Available at: <http://energyindepth.org/just-the-facts/> [Accessed 24 January 2015].

In-text: (Hydraulic Fracturing: The Process | FracFocus Chemical Disclosure Registry, 2015)

Your Bibliography: Fracfocus.org. 2015. Hydraulic Fracturing: The Process | FracFocus Chemical Disclosure Registry. [online] Available at: <https://fracfocus.org/hydraulic-fracturing-how-it-works/hydraulic-fracturing-process> [Accessed 24 January 2015].

In-text: (Gertner, 2013)

Your Bibliography: Gertner, J., 2013. George Mitchell, Father of Fracking. [online] The Lives They Lived. Available at: <http://www.nytimes.com/news/the-lives-they-lived/2013/12/21/george-mitchell/> [Accessed 24 January 2015].

In-text: (MacRae, 2012)

Your Bibliography: MacRae, M., 2012. Fracking A Look Back - ASME. [online] Asme.org. Available at: <https://www.asme.org/engineering-topics/articles/fossil-power/fracking-a-look-back> [Accessed 24 January 2015].