JACQUES, Ian. Quantitative methods. 1st pub. Harlow : Pearson, 2013. xi, 256 s. Economics expressAlways learning. Dostupné na internetu: <http://www.dandelon.com/servlet/download/attachments/dandelon/ids/CH001156BFB627DC28F72C1257BEA00388296.pdf> ISBN 978-0-273-77616-1.