A critical review of “The Ghaznavid and Seljuq Turks: poetry as a source for Iranian history”

The aim of this article is critical review of the book “The Ghaznavid and Seljuq Turks: poetry as a source for Iranian history”. Using Farrokhi and Mo῾zziʼs poem being historical source for Ghaznavid and Seljuq period is fundamental aim of this book and its advantage beside the historiography source. So, article tries to answer such questions: How much the writer of this book succeeds to cover that aim? And to what extend it has applied scientific method properly?
By some critical eye and analytical view it will be proves that this valuable study covers its objective; but it neglects methodological point and writing instrument and some references and argumentations in few parts of this book is under the question.