Bauer, Susan Wise (2010): , W.W. Norton, ISBN 978-0-393-05975-5 Canduci, Alexander (2010): , Pier 9, ISBN 978-1-74196-598-8 Duckett, Eleanor (1968): . Ann Arbor: University of Michigan Press. Comyn, Robert (1851): , bind I. Bryce, James (1913): , MacMillan. Mann, Horace, K. (1925): . Mann, Horace, K. (1925): .