The book "Shelley's Radicalism and its Sources" by Daniel MacDonald is a fundamental study of the life and work of the great English poet Percy Shelley. In this work, the author explores various aspects of Shelley's radical views, his influence on literature and the socio-political context of his time. MacDonald uncovers important sources of the idea of radicalism in Shelley's work by examining his poetry, prose and correspondence. This book is a valuable addition to the study of the work of the romantic poet and the understanding of his poetic genius.