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"IEIN." Fullformexpand.com, https://www.fullformexpand.com/iein/international-ebook-identifier-number. Accessed 19 Apr. 2026.
Fullformexpand.com, 2026. "IEIN." Accessed April 19, 2026. https://www.fullformexpand.com/iein/international-ebook-identifier-number.
"IEIN." (n.d.). Fullformexpand.com. Retrieved April 19, 2026, from https://www.fullformexpand.com/iein/international-ebook-identifier-number.
IEIN. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/iein/international-ebook-identifier-number (Accessed: 19 April 2026).