A brief history of the alarm clock - Gadget Advisor
Pixstory on LinkedIn: Before alarm clocks were invented, people were hired to wake up workers…
A Brief History of Alarm Clocks
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History In Pictures - When alarm clocks were unreliable and expensive, a knocker-upper was a person whose primary job it was to wake people up. In the 1930s, Mary Smith in this
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Wakey wakey: A history of alarm clocks and the mechanics of time
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Alarm clock - Wikipedia
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Before alarm clocks, Brits paid people to wake them up by tapping on their window | Mashable
A history of alarm clocks (and time itself) - ABC listen
Who Invented the Alarm Clock on 'The Gilded Age'?
Wakey wakey: a history of alarm clocks and the mechanics of time
