  The derivation of Feynman rules for unparticles carrying standard model
quantum numbers is discussed. In particular, this note demonstrates that an
application of Mandelstam's approach to constructing a gauge-invariant action
reproduces for unparticles the vertices one obtains through the usual minimal
coupling scheme; other non-trivial requirements are satisfied as well. This
approach is compared to an alternative method 0801.0892 that has recently been
constructed by A. L. Licht.
