APA Edition Citation

Witten, I. H. (1975). Digital computer units13&14: Operating systems ,computer languages and microprogramming TM221 13&14. Open University Press.

Chicago Edition Citation

Witten, I. H. Digital Computer Units13&14: Operating Systems ,computer Languages and Microprogramming TM221 13&14. England: Open University Press, 1975.

MLA Edition Citation

Witten, I. H. Digital Computer Units13&14: Operating Systems ,computer Languages and Microprogramming TM221 13&14. Open University Press, 1975.