APA (7th ed.) Citation

Skinner, C. (1993). Friends with english: Teacher's guide (1ª ed.).

Chicago Style (17th ed.) Citation

Skinner, Carol. Friends with English: Teacher's Guide. 1ª ed. Harlow, 1993.

MLA (9th ed.) Citation

Skinner, Carol. Friends with English: Teacher's Guide. 1ª ed. 1993.