Volker Beckmann 
The Etymology of OK [PDF ebook] 

Essay from the year 1978 in the subject English Language and Literature Studies — Linguistics, grade: 3, 0, Bielefeld University (Sprachenzentrum), course: British and American English, language: English, abstract: The paper consists of two parts. First, a dictionary check-up is being presented. Next some etymological theories about the original usage of the abbreviation ‘OK’ are summarized and exposed.