authoritative

Arising or originating from a figure of authority.

The authoritative rules in this school come not from the headmaster but from the aged matron.

Highly accurate or definitive; treated or worthy of treatment as a scholarly authority.

This book is the world's most authoritative guide to insect breeding habits.

Having a commanding style.

He instructed us in that booming, authoritative voice of his.

The fourth model is called the enlightment model: Actors are seen to be responsible for problems but unable or unwilling to provide solutions. They are believed to need discipline provided by authoritative guidance. The Alcoholic Anonymous^([sic]) groups are considered prototypical for this model.