Twarikh Guru Khalsa (Punjabi: ਤਵਾਰੀਖ ਗੁਰੂ ਖਾਲਸਾ, romanized: Tavārīkha gurū khālasā, lit. 'History of Guru Khalsa') is a historical book of the Sikhs from their origin to the time when they lost the Punjab to the British. The author of the book is Giani Gian Singh. Source: Wikipedia (en)