Explanation:

 1. Megasthenes was an ancient Greek historian, diplomat and Indian ethnographer and explorer in the Hellenistic period, author of the work Indika.

2. The Harshacharita (The deeds of Harsha), is the biography of Indian emperor Harsha by Banabhatta, also known as Bana, who was a Sanskrit writer of seventh-century CE India.

3. Chand Bardai was an Indian poet, who composed Prithviraj Raso, an epic poem in Brajbhasa about the life of the Chahamana king Prithviraj Chauhan.

4. Rajatarangini is a metrical legendary and historical chronicle of the north-western Indian subcontinent, particularly the kings of Kashmir. It was written in Sanskrit by Kashmiri historian Kalhana in the 12th century CE.