Dear Sigaba,
Thank you sooo much for your detailed comment. Albeit knowing that the term has long been used in the American historiography, it has never been utilized in my field of study,i.e. Turco-German Relations in the 1920s and 1930s. I actually benefited from the term a lot when writing my ma thesis as it enlightened my way about what to look at. So, I thought this concept can still be drawn on in this field of investigation, but , of course, there are other main theories that my work drew on.
Similarly, the book is essential for my study not only because of soft power's implementation into the context that I would like to work on, but also that it shows the Balkans played a crucial role in suppliyng Germany with required raw materials, which enabled Nazis to equip the German army well enough on the eve of WW2. Hence, by starting from the author's claim, I try to show that Turkey was also part of this German "large economic zone" (which the book does not investigate as its scope is limited to Yugoslavia and Romania). And aside from saying what it discusses and how it made me suspect Turkey's probable involvement in all these, I do not discuss the book in my entire SoP. Of course if you have time and are interested, I can pm you the entire text. But you have already helped me a lot, so thank you