Mridula Mukherjee, Aditya Mukherjee, K N Panikkar and Sucheta Mahajan had co-authored with Chandra 'India's Struggle for Independence', which was published in 1988 and forms part of the history curriculum of Delhi University.
"Deliberate misrepresentation of Bipan Chandra's views on Shaheed Bhagat Singh is being done by saying he used the term 'revolutionary terrorism' to denigrate the martyr," a joint statement by the authors said.
"Chandra, who wrote two chapters on the Revolutionary Movement, clearly said that it is 'a term we use without any pejorative meaning and for want of a different term.'
The book, mentions Bhagat Singh, Chandra Shekhar Azad, Surya Sen and others as "revolutionary terrorists" in Chapter 20. It also calls the Chittagong movement a 'terrorist act', while killing of British police officer John Sanders has been called an 'act of terrorism'.
Singh's family had written a letter to HRD Minister Smriti Irani seeking her intervention in this regard and demanded appropriate changes in the textbook.
Meanwhile the book's publishers Penguin in a statement said it was working with the authors for a revised edition of the book.
BJP MP Anurag Thakur had raised the issue in the Lok Sabha
on April 27.
Terming Thakur's attack as "vicious", the co-authors quoted Chandra's introduction to Bhagat Singh's 'Why I am an Atheist,' published in 2006, to state that the late author had stopped using the word terrorism as it had acquired a very negative meaning in recent years.
The co-authors said that Chandra had also wanted to make the change in 'India's Struggle for Independence' and had said so publicly but could not do so due to ill health.
The co-authors had planned that the volume in its revised version will use the formulation that Chandra himself made in his later writings.
"He was the person who first found and published in 1970 as a pamphlet at his own expense Bhagat Singh's now famous essay, 'Why I am an Atheist'," the statement said.
The statement also termed as "completely baseless" the allegation made by Thakur in the Lok Sabha that the book's authors praised Rahul Gandhi as a charismatic leader.
"We strongly deny since none of the authors has written anything on Rahul Gandhi," the authors said.
