Explain the different types of historical …

The sources of the medieval period can be divided into the following categories:

1. Official records: Official records were the documents issued by the ruler to his office. Official records have been found relating to the history of the Turko-Afghan rule and the Mughal rule in India.
2. Contemporary writings: Contemporary chronicles include works of Amir Khusrau, Al Beruni and Minhajuddin Siraj. All historians have discussed in depth about different aspects of the medieval period in India. 
3. Accounts of foreign travellers: Ibn Batuta’s work in Rehala (on travels) provide details of the various aspects of the Tughluq period. Another important traveller Abdur Razzaq left us valuable information on the Vijaynagar kingdom.
4. Coins and inscriptions: During the period of the Sultanate and the Mughal India, various coins were introduced by the sultans and Mughal emperors. They contain evidence related to the year of accession, the extent of the dominion of the Sultan and his relations with the neighbouring powers, etc.