Ong, W. J. (1994). Typescript Cover Letter. Saint Louis University Libraries Digitization Center.
Čikaški stil citiranja (17. izdanje)Ong, Walter J. Typescript Cover Letter. Saint Louis University Libraries Digitization Center, 1994.
MLA način citiranja (8. izdanje)Ong, Walter J. Typescript Cover Letter. Saint Louis University Libraries Digitization Center, 1994.
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