If Barkat’s book is poetry, is the world’s largest repository of Urdu and Punjabi literature. They offer free, legal PDFs of public domain works. Search for "Barkat" in their Punjabi section.
Because "Barkat" is a common pen name. Ensure you are looking for the correct author. Check the publisher’s name and the year of publication. The most famous is Barkat Ali’s "Mitti Di Khushboo" (The Scent of Soil), often mistakenly called the "Barkat Punjabi Book." Barkat Punjabi Book Pdf