APA

Gower (Roger), . (69). Grammar in Practice 1 (40 Units of Self Study Grammar Exercises). : Cambridge University Press.

Chicago

Gower (Roger), . 69. Grammar in Practice 1 (40 Units of Self Study Grammar Exercises). : Cambridge University Press.

Harvard

Gower (Roger), . (69). Grammar in Practice 1 (40 Units of Self Study Grammar Exercises). : Cambridge University Press.

MLA

Gower (Roger), . Grammar in Practice 1 (40 Units of Self Study Grammar Exercises). : Cambridge University Press. 69.