  For a higher-rank graph $\Lambda$ with sources we detail a construction that
creates a higher-rank graph $\bar{\Lambda}$ that does not have sources and
contains $\Lambda$ as a subgraph. Furthermore, when $\Lambda$ is row-finite,
the Cuntz-Krieger algebra of $\Lambda$ is a full corner of
$C^*(\bar{\Lambda})$, the Cuntz-Krieger algebra of $\bar{\Lambda}$.
