Solution:Literary sources for the study of history include the Srimad Ramayana, Srimad Mahabharata, Indica (written by Megasthenes), and Arthashastra (written by Kautilya). The Ramayana, composed by Maharshi Valmiki, originally had 6,000 verses (shlokas), which later increased to 12,000 verses, and finally reached 24,000 verses. The Mahabharata was composed by Ved Vyas, and because it eventually contained 100,000 verses, it came to be called Shat Sahasri Samhita or Mahabharata. Megasthenes was the ambassador of Seleucus Nicator. He spent 14 years in the court of Chandragupta Maurya. His work, Indica, provides details of the Mauryan-era society and culture. The Arthashastra is a major source for understanding the history and politics of the Mauryan period. Coins fall under the category of archaeological sources.