Claessen, Henri J. M. (Ed.) and Peter Skalnik (Ed.). "Frontmatter" The Early State. Berlin, Boston: DE GRUYTER, 1978. I-IV. Web. Retrieved 19 May. 2013, from http://www.degruyter.com/view/books/9783110813326/9783110813326.fm/9783110813326.fm.xml

Frontmatter (1978). The Early State (pp. I-IV). Berlin, Boston: DE GRUYTER. Retrieved 19 May. 2013, from http://www.degruyter.com/view/books/9783110813326/9783110813326.fm/9783110813326.fm.xml

Claessen, Henri J. M. (Ed.) and Peter Skalnik (Ed.). 1978. Frontmatter. In The Early State, I-IV. Berlin, Boston: DE GRUYTER. Retrieved 19 May. 2013, from http://www.degruyter.com/view/books/9783110813326/9783110813326.fm/9783110813326.fm.xml