Where to find necessary materials for Turkish Calligraphy:

Calligraphy ink, reed pens, raw silk for the ink bottle and books about calligraphy (including Dersaadet's own "Yaziya Giris" -- Introduction to Writing):
Dersaadet Bookstore Beyazsaray Business Center, Beyazit, Istanbul

Books about calligraphy and knives for sharpening reed pens:
Sahaflar Çarsisi, No. 26 In the Booksellers' Bazaar, No 26.

Maktaa -- Bone tool used for sharpening reed pens:
The old man selling items carved from bone (combs etc.) in front of Sahaflar Çarsisi (Booksellers' Bazaar)

Books in Turkish About Calligraphy:

Kalem Güzeli
Mahmud Bedreddin Yazir, Diyanet Isleri Baskanligi Yayinlari, Ankara 1989, ISBN 975-19-0051-4

Sevki Efendi'nin Sülüs ve Nesih Mesk Murakkai
Yayina hazirlayan: Doç. Dr. Muhittin Serin, Kubbealti Nesriyati
No: 44, Istanbul 1996, ISBN 975-7663-29-8

Kazasker Mustafa Izzet Efendi'nin Sülüs ve Nesih Mesk Murakkai
Yayina hazirlayan: Do. Dr. Muhittin Serin,
Kubbealti Nesriyati No: 47, Istanbul 1996, ISBN 975-7663-33-6

Osmanli Belgelerinin Dili (Diplomatik)
Mübahat S. Kütükoglu, Kubbealti Nesriyati No:35, Istanbul 1994, ISBN 975-7663-18-2

Hattat Seyh Hamdullah, Hayati, Talebeleri, Eserleri
Doç. Dr. Muhittin Serin, Kubbealti Nesriyati No:29, Istanbul 1992, ISBN 975-7663-12-3