Mihail Buchvarov. (1973). Eleven Centuries of Bulgarian Philosophical Thought. Bulgarian Academy of Sciences.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMihail Buchvarov. Eleven Centuries of Bulgarian Philosophical Thought. Sofia: Bulgarian Academy of Sciences, 1973.
एमएलए (9वां संस्करण) प्रशस्ति पत्रMihail Buchvarov. Eleven Centuries of Bulgarian Philosophical Thought. Bulgarian Academy of Sciences, 1973.
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