Fedoseev, P. N., & Timofeev, T. T. (1981). Social problems of man's environment: Where we live and work. Progress.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFedoseev, Petr Nikolaevich, और Timur Timofeevich Timofeev. Social Problems of Man's Environment: Where We Live and Work. Moscow: Progress, 1981.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFedoseev, Petr Nikolaevich, और Timur Timofeevich Timofeev. Social Problems of Man's Environment: Where We Live and Work. Progress, 1981.
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