منابع

Q#, Banknotes and Banking in the Isle of Man, Ernest Quarmby

Spink & Son London, United Kingdom

زیرعنوان: A guide for historians and collectors

ویرایش: 2nd edition

سال: 1994

Quiggi#, A Survey of Primitive Money, A. Hingston Quiggin

Methuen London, United Kingdom

زیرعنوان: The Beginnings of Currency

سال: 1949