Markandeya Purana is one of the most important Puranas. You
can download the Markandeya Purana in pdf in Hindi for free from the Ved Puran
website.
Chapter 81 to 93 of the Purana contains the stories
associated with Navratri and Durga Puja and is referred as Durga Saptashati or
Devi Mahatmyam.
Link – Markandeya Purana in pdf in Hindi
Link – Markandeya Purana in pdf in Hindi