I use calibre://book-details & show-book URL's in a long text column (#links/Links), if Books A, B and C are related:
Book A would have a show-book link to itself, and book-details links to Book B and C
Book B would have a show-book link to itself, and book-details links to Book A and C
Book C would have a show-book link to itself, and book-details links to Book A and B
Example: I link Shakespeare's The Tempest and Huxley's Brave New World. As well as the calibre://URLs, the Links columns for the two books have Miranda's:
O, wonder!
How many goodly creatures are there here!
How beauteous mankind is! O brave new world,
That has such people in't.
See
The calibre:// URL scheme
BR