Gaya APA

Azhar, B, S., Hagen, S, A. (1941). Understanding and Using English Grammar : with Answer Key (Ed. 4). Amerika Serikat: Library Of Congress.

Gaya MLA

Azhar, Betty, S.., Hagen, Stacy, A.. "Understanding and Using English Grammar : with Answer Key". Ed. 4 Amerika Serikat: Library Of Congress, 1941. Text.