See Allo

Ochs, Linnea Leedham, author

Prentice-Hall, 1987

Buku Referensi

Morton, Joyce, author

Prentice-Hall, 1998

Buku Teks

edited by Coleen K. Withgott, Austin G. Anderson

Merriam-Webster, 1981

Buku Referensi

De Vries, Mary Ann, author

Prentice-Hall, 1991

Buku Referensi

prepared under the editorial supervision of In Plain English, Inc.

Macmillan, 1996

Buku Referensi

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