Gaya APA

Canada), N, (, N, S, A, O. (2018). E-book Basic English Grammar Book 1 . USA: Saddleback Educational Publishing.

Gaya MLA

Canada), NSAC, (The, National, Sunflower, Association, Of. "E-book Basic English Grammar Book 1". USA: Saddleback Educational Publishing, 2018. Electronic Resource.