Mazkeret L'gedolei Ostroha is a history of the great rabbis of Ostroh – a four-hundred-year history, down to the early twentieth century, of Ge'onim, of heads of Jewish Courts of Law and of Yeshivas, of religious judges, of wise scribes, and of assorted leaders of Ostroh's Jewish community. It was written in 1907 by Menachem Mendel Biber. Biber first describes the history of the city and then dedicates each chapter to a famous figure who was in the city. At the end of each chapter, Biber adds the inscription that appeared on that person's tombstone. See this page for additional details about the book and a list of Ostroh Rabbis.
Ostrog Book; A Memorial to the Ostrog Holy Community (Ostroh, Ukraine): Yizkor Books are Jewish memorial books documenting communities destroyed in the Holocaust and victims of persecution. The chapters of the Ostroh Yizkor book focus on the history of the city, memories, personalities and figures, the Holocaust and bravery, the fallen in Israel, and memorials.
Jewish Virtual Library- discusses pre-Holocaust history and identity of the city as well as the Holocaust period
Encyclopedia of Ukraine- covers the history of the city with images and links to other mentions of Ostroh in the Encyclopedia of Ukraine
Wikipedia- provides general historical context
Yivo Encyclopedia- details Jewish history in the city
Encyclopedia of Jewish Communities in Poland, Volume V (Translation of “Ostrog” chapter from Pinkas Hakehillot Polin)- this volume of the Encylopedia covers the mostly the Jewish history of the city through its liberation in 1944.
Shtetl Routes- discusses Jewish history and offers travel recommendations, including general and Jewish landmarks