Stock, Wolfgang G. and Mechtild Stock. Handbook of Information Science. Berlin, Boston: De Gruyter Saur, 2013. Web. Retrieved 18 Jun. 2013, from http://www.degruyter.com/view/product/174024

Stock, W. & Stock, M. (2013). Handbook of Information Science. Berlin, Boston: De Gruyter Saur. Retrieved 18 Jun. 2013, from http://www.degruyter.com/view/product/174024

Stock, Wolfgang G. and Mechtild Stock. 2013. Handbook of Information Science. Berlin, Boston: De Gruyter Saur. Retrieved 18 Jun. 2013, from http://www.degruyter.com/view/product/174024