Was "Dead poet's society" a book first or a film?!

Question: i don't know wether the book was written first or the film was made first!

---

---

Answers: i don't know wether the book was written first or the film was made first!

---

---

It was written for the screen and later adapted into a novel.

---

---

book

---

---

The book

---

---

Not sure, but I love the movie

---

---

---