https://www.jstor.org/stable/44223190
https://digitalcollections.nypl.org/items/510d47e0-fc69-a3d9-e040-e00a18064a99
https://www.google.co.uk/books/edition/The_Bulletin/RKUrAAAAYAAJ?hl=en&gbpv=1&bsq=%22Albert+bonnet%22+guards&dq=%22Albert+bonnet%22+guards&printsec=frontcover
https://www.google.co.uk/books/edition/Military_Fashion/Dv1CAAAAIAAJ?hl=en&gbpv=1&bsq=%22Albert+bonnet%22+guards&dq=%22Albert+bonnet%22+guards&printsec=frontcover
https://collection.nam.ac.uk/detail.php?acc=1997-12-77-1
https://www.google.co.uk/books/edition/British_Infantry_Uniforms_Since_1660/9gIhAQAAIAAJ?hl=en&gbpv=1&bsq=1854+%22field+service+cap%22&dq=1854+%22field+service+cap%22&printsec=frontcover
