We show that the confining term in the widely used Cornell form of QCD potential is derivable from the gluon superpropagator for an exponential form of gluon self-interaction, if one assumes that the gluon--gluon coupling constant has the character of a running coupling constant. We also consider a rational form of self-interaction.

PACS numbers: 12.38.Mh, 12.38.Lg