Coba jelasin Lihat pula dari Marxists Internet Archive dong

Noam Cohen, "Who’s Attacking an Online Marxist Archive? China Is Suspected of Trying to Block Access to Texts," New York Times, Feb. 5, 2007.

Noam Cohen, "Claiming a Copyright on Marx? How Uncomradely," New York Times, April 30, 2014.

Jennifer Howard, "Readers of Marx and Engels Decry Publisher’s Assertion of Copyright," The Chronicle of Higher Education, April 29, 2014.

Scott McLemee, "Value, Price, and Profit," Inside Higher Ed, April 30, 2014.