Gaya APA

G., A, L., Longman, . (1990). Longman English Grammar Practice for intermediate Student: Self Study Edition with key . United States of America: Longman Group UK.

Gaya MLA

G., Alexander, L.., Longman, . "Longman English Grammar Practice for intermediate Student: Self Study Edition with key". United States of America: Longman Group UK, 1990. Buku Text.