Foundation. Lipkes, J. Rehearsals. The GermanArmy in Belgium August 1914. Leuven: Leuven University Press. 2007. ISBN 978-3-515-09159-6. Spears, E. Liaison
ISBN 0-7136-2223-7. Keppie, Lawrence. The Making of the Roman Army from Republic to Empire. New York: Barnes and Noble Books. 1994. ISBN 1-56619-359-1.