The author cites various statistics to back up his assertions.

Further authors then cited Green's books as their source for the claimed flight.

The authors cite a number of possible reasons mostly associated with lower stress levels in a religious community.

"We took the 101 companies the authors cited and examined how effectively they use technology," he said.

Perhaps they do, but the only evidence the author cites is a travel agent and a psychologist.

The authors cite extensive evidence in support of both claims.

The author cites letters, which were sent to him from different parts of the country.

One author cites her as the "elegant glamour girl of the screen".

What authority can the author cite for such statements?

Many authors cite research papers without actually reading the paper or it having an important influence on their work.