The fundamental organizational unit within the Imperial Navy was the line. Captains of the line held command over these formations. Despite the common intention for a line to consist of four starships, the actual composition rarely matched this ideal, with only a small fraction (7%) adhering to the four-ship structure. The size of a line could vary substantially, ranging from a solitary vessel to groupings of twenty or more. Notably, a single Star Destroyer was often regarded as a line in its own right.
- Imperial Sourcebook
- Imperial Sourcebook, Second Edition
- Pirates & Privateers
- " Special Military Unit Intelligence Update " — Star Wars Adventure Journal 15 (as naval line)
- The Far Orbit Project
- Star Wars: Imperial Handbook: A Commander's Guide