Zugzwang puzzles can be tricky. This what I learned from chessmagnet school. Ask yourself this, "If I could pass on my move what would my opponent do? This can point you in the right direction!
Help! need some zugzwang problems!

Here a situation of mutual Zugzwang.
Black play and White wins.
If it were his move White would lose.
Am interested in any sources, books, dvd, online collections ect. Thoughts on or insights to this element of chess are welcomed here also.
The subtleness of these problems is something I enjoy.
They can be difficult to spot, at least for me, but perhaps a little more rewarding and esthetically pleasing once solutions are discovered, then the avarage study.
Thanks in advance for any leads or thoughts.