1. An Action a Day
   Keeps Global Capitalism Away
   Resource Type: Book
   First Published: 2004
   
2. Community Workshops for the Environment
   An Organizer's Manual
   Resource Type: Book
   First Published: 1989
   A guide to organizing ecology workshops.
3. Connexions Digest
   Issue 50 - December 1989 - A Social Change Sourcebook
   Resource Type: Serial Publication (Periodical)
   First Published: 1989
   
4. Don't Forget to Write
   Resource Type: Article
   First Published: 1997
   Writing letters to the editor is an effective way of getting publicity for your point of view.
5. Ireland and the Irish Question
   Resource Type: Book
   First Published: 1971
   Brings together all of Marx's and Engels' writing on Ireland in one volume.
6. Letters from Lexington
   Reflections on Propaganda
   Resource Type: Book
   First Published: 1993
   
7. Letters from Prison to Sophie Liebknecht
   Resource Type: Article
   First Published: 1918
   
8. Marx and Engels Collected Works Volume 38
   Marx and Engels 1844 - 1851
   Resource Type: Book
   Letters.
9. Marx and Engels Collected Works Volume 39
   Marx and Engels 1852 - 1855
   Resource Type: Book
   Letters.
10. Marx and Engels Collected Works Volume 40
    Marx and Engels 1856 - 1859
    Resource Type: Book
    Letters.
11. Marx and Engels Collected Works Volume 41
    Marx and Engels 1860 - 1864
    Resource Type: Book
    Letters.
12. Marx and Engels Collected Works Volume 42
    Marx and Engels 1864 - 1868
    Resource Type: Book
    Letters.
13. Marx and Engels Collected Works Volume 43
    Marx and Engels 1868 - 1870
    Resource Type: Book
    Letters.
14. Marx and Engels Collected Works Volume 44
    Marx and Engels 1870 - 1873
    Resource Type: Book
    Letters.
15. Marx and Engels Collected Works Volume 45
    Marx and Engels 1874 - 1879
    Resource Type: Book
    Letters.
16. Marx and Engels Collected Works Volume 46
    Marx and Engels 1880 - 1883
    Resource Type: Book
    Letters.
17. Marx and Engels Collected Works Volume 47
    Engels 1883 - 1886
    Resource Type: Book
    First Published: 1886
    Letters.
18. Marx and Engels Collected Works Volume 49
    Resource Type: Book
    First Published: 1892
    
19. Marx and Engels Collected Works Volume 50
    Resource Type: Book
    First Published: 1895
    
20. The Sources HotLink 
    Resource Type: Website
    First Published: 1996   Published: 2009
    A website and newsletter dealing with media relations strategies.
21. Working for Peace
    A Handbook of Practical Psychology and Other Tools
    Resource Type: Book
    First Published: 1985
    A survey of the attitudes and tools that can be used in working for peace.
22. The Write Stuff
    All you ever wanted to know about letter writing
    Resource Type: Article
    First Published: 1989
    The basics to effective letter writing lies in a little research on the writer's part and their ability to point out weakness in their targets.

Experts on Cartas/Letras in the Sources Directory

1. Universal Postal Union