Soil erosion Iceland - Earth Sciences bibliographies - in Harvard style

In-text: (Dugmore et al., 1999)

Your Bibliography: Dugmore, A., Church, M., Buckland, P., Edwards, K., Lawson, I., McGovern, T., Panagiotakopulu, E., Simpson, I., Skidmore, P. and Sveinbjarnardóttir, G., 1999. The Norse landnám on the North Atlantic islands: an environmental impact assessment. Polar Record, 41(1), pp.21-37.

In-text: (Dugmore, Gisladóttir, Simpson and Newton, 2009)

Your Bibliography: Dugmore, A., Gisladóttir, G., Simpson, I. and Newton, A., 2009. Conceptual Models of 1200 Years of Icelandic Soil Erosion Reconstructed Using Tephrochronology. Journal of the North Atlantic, 2(1), pp.1-18.

In-text: (2015)

Your Bibliography: Herbologymanchester.files.wordpress.com. 2015. [online] Available at: <https://herbologymanchester.files.wordpress.com/2014/08/dsc_0102.jpg> [Accessed 7 March 2015].

In-text: (Streeter and Dugmore, 2014)

Your Bibliography: Streeter, R. and Dugmore, A., 2014. Late-Holocene land surface change in a coupled social–ecological system, southern Iceland: a cross-scale tephrochronology approach. Quaternary Science Reviews, 86, pp.99-114.