Gaya APA

DKK, R, A, A. (1977). KEYS TO SPELLING MASTERY . OKLAHOMA: THE ECONOMIST PUBICATIONS LTD..

Gaya MLA

DKK, RUEL, A., ALLRED,. "KEYS TO SPELLING MASTERY". OKLAHOMA: THE ECONOMIST PUBICATIONS LTD., 1977. Prodi S1 Sastra Inggris.