APA (7th ed.) Zitazioa

Harper, C. G. A Practical Hand-book of Drawing for Modern Methods of Reproduction.

Chicago Style (17th ed.) Zitazioa

Harper, Charles G. A Practical Hand-book of Drawing for Modern Methods of Reproduction.

MLA (9th ed.) Zitazioa

Harper, Charles G. A Practical Hand-book of Drawing for Modern Methods of Reproduction.

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