Useful Resources for Finding Perspectives on the Execution of Mary Queen of Scots.
NOTE: There are several of books in the library that can help you here, as well as the digital resources listed below.
Perspectives From Tudor Times:
Account of Pierre de Bourdeille (a French noble): http://www.eyewitnesstohistory.com/maryqueenofscots.htm
(Note that this site also provides a short but very useful overview of Mary's life and death)
A helpful bio of Pierre de Bourdeille: https://www.newadvent.org/cathen/02742a.htm
Eyewitness account from Robert Wynkfield: http://tudorhistory.org/primary/exmary.html
Mary's own Perspective (through her letters and testimony from her trial): http://www.marie-stuart.co.uk (use links at left to navigate).
Elizabeth's Perspective (through letters to Mary and to James VI of Scotland): https://englishhistory.net/tudor/relative/elizabeth-is-letters-about-mary-queen-of-scots/
More Modern Perspectives:
The Catholic Encyclopaedia (various authors, published 1917): http://www.newadvent.org/cathen/09764a.htm
Luminarium Encyclopaedia (various authors, 2007): http://www.luminarium.org/encyclopedia/maryqueenofscots.htm
Claire Ridgway, from The Elizabeth Files (includes some evidence from Tudor times as well) : http://www.elizabethfiles.com/the-execution-of-mary-queen-of-scots-8th-february-1587/4725/
Elena Maria Vidal, from her Tea at Trianon Blog: http://teaattrianon.blogspot.co.nz/2009/02/execution-of-mary-queen-of-scots.html
The Mary Stuart Society Website (various authors, use links on the left hand side to navigate): http://www.marie-stuart.co.uk
Linda Porter, a modern historian who writes for the BBC History magazine, has written this book review and produced this podcast. And here are links to a series of reviews of her book and the Tudors and Stuarts.
Here are videos that you can use both to understand the topic, and as sources for historical perspectives of the modern historians who wrote the documentaries:
David Starkey, from the documentary Elizabeth
This episode deals with the early days of Elizabeth's queenship. If you want to skip straight to the Mary Queen of Scots material, skip straight to Part 9. Parts 13-17 deal with her fate under Elizabeth's captivity, although there is a lot of additional material about Elizabeth's life in there too.
A shorter summary of how Starkey sees the situation can be found in this documentary, starting at 40:15:
Another Starkey Source: "Scotland adores failure"
There is also an important quote from Starkey in the slideshow on the Mary-Background page.
Simon Schama: A History of Britain, Episode 7: The Body of a Queen
Unfortunately, this video has been removed from YouTube by the BBC. It's worth tracking down!