If you truly cannot buy the book, here is a halal alternative:
The Indonesian translation of "Muhammad" by Martin Lings is available under the title "Muhammad: Biografi Ringkas". The translation was done by A. S. Hikam and published by several publishers, including Pustaka Al-Kautsar and Penerbit Erlangga.
Some Islamic institutions in Indonesia (like or Paramadina Foundation ) have purchased institutional licenses for digital copies. If you are a student, ask your university library if they provide a secure PDF via EBSCO or OverDrive.
Buku (judul asli: Muhammad: His Life Based on the Earliest Sources
Unlike modern biographies that dissect the Prophet’s life through a sociological or political lens, Lings wrote with a . He relies almost exclusively on the earliest Arabic sources—Ibn Ishaq, Ibn Hisham, and al-Tabari—while weaving them into a narrative that reads like an epic poem.
First published in 1983, the book stands out for its unique narrative style that combines rigorous historical scholarship with a poetic, almost epic quality.
Martin Lings' masterpiece, Muhammad: His Life Based on the Earliest Sources