O'Brien, C. (2019). Scholastic 2020 book of world records (Fifth edition, updated 2020 edition.). Scholastic Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रO'Brien, Cynthia. Scholastic 2020 Book of World Records. Fifth edition, updated 2020 edition. New York, NY: Scholastic Inc., 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रO'Brien, Cynthia. Scholastic 2020 Book of World Records. Fifth edition, updated 2020 edition. Scholastic Inc., 2019.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.