Παραπομπή APA

Elsworth, S., & Walker, E. (1986). Grammar practice for intermediate students.

Παραπομπή Chicago Style

Elsworth, Steve, και Elaine Walker. Grammar Practice for Intermediate Students. Hyderabad, Orient Longman, 1986.

Παραπομπή MLA

Elsworth, Steve, και Elaine Walker. Grammar Practice for Intermediate Students. 1986.