Bibliographical works are almost always considered to be tertiary sources.

Research should include primary, secondary, and tertiary sources.

Malik developed a tertiary source called al-maslahah al-mursalah, which means that which is in the best interests of the general public.

Similar to Abu Hanifa and Malik, he developed a tertiary source of legislation.

A tertiary source is an index and/or textual condensation of primary and secondary sources.

Some examples of tertiary sources are almanacs, guide books, survey articles, timelines, and user guides.

In some academic disciplines the distinction between a secondary and tertiary source is relative, but in historiography it is absolute.

They may be primary sources, secondary sources, tertiary sources and so on.

(Some tertiary sources claim that the opera was produced in Vienna in 1864.)

A new way has been recently suggested to define dyspareunia by dissecting it into primary, secondary, and tertiary sources of pain.