Under what circumstances should the last name of only the first author of a six or more author reference, followed by "et al.". be included with the citation in the body of the text?

Babies love toys such as shape sorters, cabinetsthat open and close, pocketbooks with hidden

treasures, and adults who play peek-a-boo with them. All of these help children to develop which concept that allows them to see that things that are out of sight are not gone forever? a. Object permanence b. Deferred imitation c. Object concept d. Violation of expectations

The most researched scales of the Strong Interest Inventory are the

a) Basic Interest Scales b) General Occupational Theme Scales c) Personal Style Scales d) Occupational Scales