Broken cross-reference issue, Section 14.7

[knakaj]

Please check the current issues Many bug reports are duplicates, this just creates more work for us. Searching the issues first may give you your answer or a workaround! If not adding new information to an existing report is much more helpful than a new report.

What Course are you in
thinkcspy

What Page were you on
Section 14.7

What is your username
Nakaj

Describe the bug
A clear and concise description of what what you were trying to accomplish and what went wrong. Vague statements like X does not work are not helpful. Imagine if one of your students sent you an email that said, "My program doesn't work, whats wrong with it?" Could you help them with only that to go on?
A link referring to Section 12.1 does not work.

Traceback
If you got here through the Bug Report page and there was a stack trace, please paste it here
N/A

Javascript Errors
Many many errors can be quickly diagnosed from the Javascript Console error log. On Chrome this is View --> Developer --> Javascript Console, on Safari ⌥⌘i or Develop --> Show Web Inspector on Firefox Tools --> Web Developer --> Toggle Tools
N/A