Extreme Macro Photography

http://extreme-macro.co.uk/stackshot/

https://macro-toolbox.com/toolbox/simple-stackshot-controller/

http://www.earthboundlight.com/phototips/focus-stacking-helicon-remote-and-stackshot.html

http://www.juliancremona.co.uk/Techniques/focusstacking.xhtml

http://nikongear.net/revival/index.php?topic=7331.0

https://books.google.com.au/books?id=XQzpAwAAQBAJ&pg=SA6-PA15&lpg=SA6-PA15&dq=using+stackshot&source=bl&ots=3CS1Y-T9ig&sig=Re-Gka2ifZk2sUEk09fi3_v95WY&hl=en&sa=X&ved=0ahUKEwj697rky-vbAhVIfLwKHZChAb84HhDoAQg1MAM#v=onepage&q=using%20stackshot&f=false

http://www.robotroom.com/Macro-photography-vs-Microscope-5.html

https://www.diyphotography.net/how-to-build-an-automated-rail-for-crazy-macro-shots/