This website would be a good resource for teachers and students. It archives many of Mao Zedong's written work, poetry and images. It is an impressive archive of his writings from his early works to the Civil War period to the Socialist Revolution. It includes quotations and selected works by volumes. I think this website would be useful when looking deeper into Mao's thought and politics.
The link to this website: http://www.marxists.org/reference/archive/mao/index.htm