The 500-page book, by financial services executive-turned author Amardeep Singh, is his personal journey.
Singh travelled through West Punjab, Northwest Frontier and Pakistan-occupied Kashmir covering the rich history of the Sikhs, while in search of his roots of origin and the loss of his extended family in the massacre.
Professor Tan Tai Yong launched the book 'Lost Heritage: The Sikh Legacy in Pakistan' as he highlighted the magnitude of the migration -- 4.5 million Sikhs and Hindus uprooted from their homes in West Punjab and moved east while 5.5 million Muslims went in the opposite direction to Pakistan.
"With this exodus came the emergence of the Sikh diaspora," Tan said yesterday.
"Many of the sites featured in this book are probably unknown to younger generations of Sikhs living in the diaspora," he said, pointing out that numerous of these sites have been forgotten and are falling into serious disrepair.