Mohenjo-daro: Seal: M-1151 a: Sayid Ghulam Mustafa Shah and Asko Parpola, 1991: Corpus of Indus Seals and Inscriptions: Volume 2: Page 130: Collections in Pakistan: Suomalainen Tiedeakatemia.
Indus Script Sign Number 2199: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.