Бинарни систем — разлика између измена

* {{Cite book | ref = harv | last=Sanchez |first=Julio |last2=Canton |first2=Maria P. |year=2007 |title=Microcontroller programming: the microchip PIC |location=Boca Raton, FL |publisher=CRC Press |page=37 |idisbn=ISBN 978-0-8493-7189-9}}

* {{Cite book| ref=harv|last=Redmond|first=Geoffrey|last2=Hon|first2=Tze-Ki|title=Teaching the I Ching|date year=2014|publisher=Oxford University Press|idisbn=ISBN 978-0-19-976681-9}}