Attendance query program (GUI) using PAGE, tkinter, and pandas - Sajeewa Pemasinghe
Python 3 Tkinter Showing Popup MessageBox Dialog Box Using msgbox.showinfo() Method on Button Click in GUI Desktop App Full Project For Beginners - Coding Shiksha
Mr B
Dialog box Placement in Tkinter with Python - Stack Overflow
11. Dialogs in Tkinter | Tkinter | python-course.eu
tkinter - Is there a message box which displays copy-able text in Python 2.7? - Stack Overflow