Kazab by Allama Abu Khalid Tipu has been made available online by Aalami Majlise Tahafuze Khatam e Nabuwat and can also be viewed on AMTKN website.
The entire book is a must must must read and contains factual information on the life, aqaid and sexual transgressions of Yusuf Kazab.
Page 21 of the book contains the statement of Moulana Shah Ahmed Norani, whereby he refered to the historic event of ambassadors of Museelma Kazab meeting Hazrat Abu Bakr RA and gave a verdict that Yusuf Kazab and all his followers are wajib ul qatal.
Page 22 of the book contains the statement of Dr Ghulam Murtaza Malik a renowned scholar of the time. Dr Murtaza Malik highlights how Yusuf Kazab looted hefty sums of money from a lot of people whom Dr Ghulam Murtaza Malik knew personally.