Παραπομπή APA

(1988). Sarvey and assessment of statistical and research services related to building materials in the Escwa region. United Nations.

Παραπομπή Chicago Style

Sarvey and Assessment of Statistical and Research Services Related to Building Materials in the Escwa Region. United Nations, 1988.

Παραπομπή MLA

Sarvey and Assessment of Statistical and Research Services Related to Building Materials in the Escwa Region. United Nations, 1988.

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