The Bible is the primary written reference used by members of the Center.

The primary reference of the sign was to the situation in which it was given.

For aircraft the primary visual reference used is usually the relationship between the aircraft's "nose" or cowling against the natural horizon.

This conclusion is not supported by the primary reference these catalogs all use.

It is still a primary reference on soaring.

The book remains the "primary reference for the identification of West Indian fishes".

This work is considered one of the primary references for asanas in the field of yoga today.

He was one of the main theorists of contemporary reintegracionism and his works on this field are considered a primary reference.

All later usages of the term Yeshu are derived from these primary references.