How does an emulsifier stabilize an emulsion?

Emulsion can be stabilized by increasing the repulsion between the dispersed phase i.e., by increasing the electrostatic repulsion (which is long range) or steric repulsion (short range). Emulsifiers are amphiphiles that reduce the interfacial tension between the two phases and contribute to the stabilization of dispersed droplets with electrostatic or steric effects.

I wish to know the detailed mechanism by which emulsifiers stabilize an emulsion. References will be of real help.

Thanks.