Evidence Explained by Elizabeth Shown Mills has a page on Memorial Plaques in a cemetery. (page 216) I would think this also applies to a plaque in a police precinct, of course replacing the Cemetery with the police precinct.
Source List Entry Cemetery, Location, Item Type or Format
Example: Congregation Beth Am Sanctuary (Alamonte Springs, Florida). Yahrzeit (memorial) plaques.
First (Full) Reference Note 1. Cemetery, Location, Item, Data collection Info, Date Read or Photographed
Example: 1. Congregation Beth Am Sanctuary (Alamonte Springs, Florida), Arthur B Friedman yahrzeit (memorial) plaque; Photographed by Gladys Friedman Paulin, 1 October 2005
Subsequent Short Note 11. Cemetery, Location, Item
Example: 11. Congregation Beth Am Sanctuary (Alamonte Springs, Fla), Arthur B. Friedman yahrzeit plaque.
Source: Mills, Elizabeth Shown. _Evidence Explained_. Baltimore: Genealogical Publishing Company, 2007. p 216
Evidence Explained by Elizabeth Shown Mills has a page on Memorial Plaques in a cemetery. (page 216) I would think this also applies to a plaque in a police precinct, of course replacing the Cemetery with the police precinct.
Source List Entry
Cemetery, Location, Item Type or Format
Example:
Congregation Beth Am Sanctuary (Alamonte Springs, Florida). Yahrzeit (memorial) plaques.
First (Full) Reference Note
1. Cemetery, Location, Item, Data collection Info, Date Read or Photographed
Example:
1. Congregation Beth Am Sanctuary (Alamonte Springs, Florida), Arthur B Friedman yahrzeit (memorial) plaque; Photographed by Gladys Friedman Paulin, 1 October 2005
Subsequent Short Note
11. Cemetery, Location, Item
Example:
11. Congregation Beth Am Sanctuary (Alamonte Springs, Fla), Arthur B. Friedman yahrzeit plaque.
Source: Mills, Elizabeth Shown. _Evidence Explained_. Baltimore: Genealogical Publishing Company, 2007. p 216
I would put in the geographical coordinates / Google Earth link and a photograph of the plaque.