Coba jelasin Kepangkatan dari Departemen Kepolisian Kota New York dong

Penegakan hukum di Kota New York

Kantor Administrasi Pengadilan dan Dengar Pendapat Kota New York

"With the Sky Police", Popular Mechanics, January 1932 article about the NY City Police Air Force and the Keystone-Loening Commuter in service at that time, photos pp. 26–30

NYPD Annual Reports 1912–1923 (digitized books) from the Lloyd Sealy Library on the Internet Archive

Historical images from the NYPD Annual Reports, 1923–23 from the Lloyd Sealy Library Digital Collections

Organisasi yang didirikan tahun 1845