The reasons why oil prices fluctuate so frequently - Math bibliographies - in Harvard style

In-text: (Factors that Could Threaten the Oil & Gas Industry in the Future, 2014)

Your Bibliography: Oilprice.com. 2014. Factors that Could Threaten the Oil & Gas Industry in the Future. [online] Available at: <http://oilprice.com/Energy/Energy-General/Factors-that-Could-Threaten-the-Oil-Gas-Industry-in-the-Future.html> [Accessed 15 December 2014].

In-text: (Why the oil price is falling, 2014)

Your Bibliography: The Economist. 2014. Why the oil price is falling. [online] Available at: <http://www.economist.com/blogs/economist-explains/2014/12/economist-explains-4> [Accessed 14 December 2014].

In-text: (Wilkinson, 2013)

Your Bibliography: Wilkinson, J., 2013. Supplier Power (one of Porter's Five Forces) • The Strategic CFO. [online] Strategiccfo.com. Available at: <http://strategiccfo.com/wikicfo/supplier-power-one-of-porters-five-forces/> [Accessed 15 December 2014].