Saya mau tau Sumber dari Nicephorus Phocas. Jelaskan dalam bahasa melayu

Taxiarchis Kolias, " Nicephorus II Focas 963–969, The Military Leader Emperor and his reforms ", Vasilopoulos Stefanos D. Athens 1993, , (Worldcat, Greek National Bibliography 1993,  Biblionet).

Ioannes A. Melisseides & Poulcheria Zavolea Melisseidou, "Nikefhoros Phokas (El) Nikfur", ek ton Leontos tou Diakonou, Kedrenou, Aboul Mahasen, Zonara, Ibn El Athir, Glyka, Aboulfeda k.a. Historike Melete, Vol.1–2, Vergina, Athens 2001,  (Vol.1)  (Vol.2), (Worldcat, Greek National Bibliography 2001/2007/2009,  Biblionet).