This is going a bit all over the place so let's see if we can bring it back into 'focus'.
Depth of field is a product of two things: Aperture; and magnification. The larger the aperture, the shallower the DOF. The larger the magnification, the shallower the DOF. Magnification is a product of two things: Focal length of the lens and distance to subject. The closer to the subject, the more magnification. The longer the focal length, the greater the magnification.
The issue isn't really any different from small sensored P&S cameras vs. larger sensored DSLRs.
With the smaller sensored camera you have to either (a) use a shorter focal length lens to get the same field of view or (b) be further away from the subject or (c) some combination of the two. Any of these result in less magnification at any given aperture which will result in greater DOF.
Larger sensored cameras allow you to (a) use a longer focal length lens (b) be closer to your subject or (c) some combination of the two. Any of these will result in greater magnification at any given aperture which will result in shallower DOF.
Higher end cameras with larger sensors allow more creative control of the scene.
In terms of articles, I have a series on my blog called Photo Basics. One of the articles is on Aperture & Depth of Field
. It contains an example of varying DOF at different aperture settings and constant distance to subject.