The purpose in writing this book is to fulfill knowledge about Librarians in North Sumatera Especially. And how to find satisfaction reader about function library, include sum of library in North Sumatera. In arranging this book, the writer truly get lots challenges and obstructions but with help of many person, those obstructions could pass. The writer also realized there are still many mistakes in process of writing this book. Because of that, the writer says thank you to all person who helps in the process of writing this book. Hopefully Allah replies all helps and bless you all. The writer realized that theqq book still imperfect in arrangement and the content. The writer hopes criticism from the readers can help the writer in perfecting the next book. Last but not the least hopefully, this book can help the readers to gain more knowledge about Librarian major