  We perform a virial analysis of starless dense cores in three nearby
star-forming regions : L1688 in Ophiuchus, NGC 1333 in Perseus, and B18 in
Taurus. Our analysis takes advantage of comprehensive kinematic information for
the dense gas in all of these regions made publicly available through the Green
Bank Ammonia Survey Data Release 1, which used to estimate internal support
against collapse. We combine this information with ancillary data used to
estimate other important properties of the cores, including continuum data from
the James Clerk Maxwell Telescope Gould Belt Survey for core identification,
core masses, and core sizes. Additionally, we used \textit{Planck} and
\textit{Herschel}-based column density maps for external cloud weight pressure,
and Five College Radio Astronomy Observatory $^{13}$CO observations for
external turbulent pressure. Our self-consistent analysis suggests that many
dense cores in all three star-forming regions are not bound by gravity alone,
but rather require additional pressure confinement to remain bound. Unlike a
recent, similar study in Orion~A, we find that turbulent pressure represents a
significant portion of the external pressure budget. Our broad conclusion
emphasizing the importance of pressure confinement in dense core evolution,
however, agrees with earlier work.
