✔ 最佳答案
A number of excellent biographies can be found here:
http://www.marxists.org/archive/marx/bio/index.htm
That site, of course, has rather a Marxist perspective, so what you'll find is primarily laudatory. The standard 1918 Mehring biography of Marx, which is relatively balanced, can be found there, though:
http://www.marxists.org/archive/mehring/1918/marx/
You might also try David McLellan's recently revised study of Marx, now in its fourth edition:
http://www.amazon.com/gp/product/1403997306/ref=cm_cr_pr_product_top
Good luck!