How to read project.properties and all paths of library project from it with Ant?

How to read project.properties and all paths of library project from it
with Ant?

I tried to read project.properties with following content. I've used
property with prefix, but can not reach my point.
target=android-17
android.library.reference.1=submodules/Switchbar
android.library.reference.2=submodules/Volley
android.library.reference.3=libs/ActionBar/library
I just wanna get string or
list[submodules/Switchbar,submodules/Switchbar,libs/ActionBar/library],
and try to use them for other requirements.
thank you.