12. A method as recited in claim 10 , wherein the electronic device further includes a keypad, and wherein the second user input is received via the keypad of the electronic device.
10. A method comprising: under control of an electronic device configured with specific executable instructions and having a touch-sensitive display, receiving a first user input selecting a portion of a content item being output by the touch-sensitive display, the first user input being received via the touch-sensitive display; causing display of a first reference work entry associated with the portion of the content item on the touch-sensitive display at least partly in response to the receiving of the first user input; receiving a second user input requesting to view a second reference work entry associated with the portion of the content item, the second user input comprising an additional amount of force on the touch-sensitive display; causing display of a second, different reference work entry associated with the portion of the content item on the touch-sensitive display at least partly in response to the receiving of the second user input; and measuring an amount force on the touch-sensitive display of the first user input.