BibTeX has several entries like @masterthesis and @article as well as several fields. The Type has to be defined for mastersthesis, otherwise, it will say "Unpublished Master's Thesis", when using APA style


This is also discussed in the MSthesis-ProQuest-Cite Repository.

If the box is overfull and LaTeX document goes into the edge space, then enable sloppy mode, as in:

\begin{sloppypar} % avoid paragraph being too long and spill over next line.
This text is very narrow and has a long number in math mode, \SI{12.4132 x 9875.232}{\nano\meter}.