APA (7th ed.) Citation

Pin, J. E. (1986). Varieties of formal languages (Revised and updated.). North Oxford Academic.

Chicago Style (17th ed.) Citation

Pin, J. E. Varieties of Formal Languages. Revised and updated. London: North Oxford Academic, 1986.

MLA (9th ed.) Citation

Pin, J. E. Varieties of Formal Languages. Revised and updated. North Oxford Academic, 1986.

Warning: These citations may not always be 100% accurate.