APA استشهاد

Organisation for Economic Co-operation and Development. (1979). The state of the environment in OECD member countries. OECD.

استشهاد بنمط شيكاغو

Organisation for Economic Co-operation and Development. The State of the Environment in OECD Member Countries. Paris: OECD, 1979.

MLA استشهاد

Organisation for Economic Co-operation and Development. The State of the Environment in OECD Member Countries. OECD, 1979.