Cook, C. (1988). Pears cyclopaedia, 1988-89: A book of background information and reference for everyday use (97th ed.). Penguin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCook, Christopher. Pears Cyclopaedia, 1988-89: A Book of Background Information and Reference for Everyday Use. 97th ed. Penguin, 1988.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCook, Christopher. Pears Cyclopaedia, 1988-89: A Book of Background Information and Reference for Everyday Use. 97th ed. Penguin, 1988.
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