Useful link where is well explained the difference between interaction term and interaction effect, with non linear models. Bibliography is included in the first page. You can also find .do for the implementation of the different why to compute the marginal effect of the interaction term (i.e., the interaction effect).

http://www.crmportals.com/crmnews/Interaction%20term%20vs.%20interaction%20effect%20in%20logit%20and%20probit%20models.pdf