Worth reading
Anarchism and Revolution: who was Mikhail Bakunin?
Anarchism in Mexico
Pierre-Joseph Proudhon
Mikhail Bakunin (Encyclopedia Brittanica article)
The Anarchist Prince: Who was Peter Alekseyevich Kropotkin?
Nestor Makhno: The Last Years of living Abroad
Makhno, Nestor (Internet Encyclopedia of Ukraine article)
Nestor Makhno: The Man and the Myth
Manifesto of the Makhnovists
The Anarchist Spirit (Counter-argument)
Mikhail Bakunin
Not worth reading (based on many factors)
Diary of Halina Kuzmenko (wife of Nestor Makhno)
Pierre-Joseph Proudhon Father of Anarcho-Mutualism