Dinosaurs were killed by asteroids. - Earth Sciences bibliographies - in Harvard style

In-text: (Canadianone, 2010)

Your Bibliography: Canadianone, T., 2010. How does a hypothesis become a theory? - Yahoo Answers. [online] Answers.yahoo.com. Available at: <https://answers.yahoo.com/question/index?qid=20100816155338AAzP3lN> [Accessed 15 February 2015].

In-text: (Sample, 2014)

Your Bibliography: Sample, I., 2014. Asteroid's 'bad timing' killed off dinosaurs, new evidence shows. [online] the Guardian. Available at: <http://www.theguardian.com/science/2014/jul/28/dinosaurs-asteroid-bad-timing-killed-off-biodiversity-edinburgh-scientists> [Accessed 15 February 2015].

In-text: (Society, 2015)

Your Bibliography: Society, N., 2015. Dinosaur Extinction, Cretaceous-Tertiary Extinction Information, Prehistoric Facts -- National Geographic. [online] National Geographic. Available at: <http://science.nationalgeographic.com/science/prehistoric-world/dinosaur-extinction/> [Accessed 15 February 2015].

In-text: (Cretaceous–Paleogene extinction event, 2015)

Your Bibliography: Wikipedia. 2015. Cretaceous–Paleogene extinction event. [online] Available at: <http://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_extinction_event> [Accessed 15 February 2015].