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- ^ Li, Yu (2020). The Chinese Writing System in Asia: An Interdisciplinary Perspective. Routledge. ISBN 978-1-138-90731-7.
- ^ Qiu Xigui (2000) [1988]. Chinese Writing. Early China Special Monograph Series. Vol. 4. Translated by Mattos, Gilbert L.; Norman, Jerry. Berkeley: Society for the Study of Early China and The Institute of East Asian Studies, University of California. ISBN 978-1-55729-071-7.
- ^ Pages 104–107.