multiple=True prevents blank option · Issue #197 · SmileyChris/django-countries · GitHub
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What is the difference between null=True and blank=True in Django?
python - What is the difference between null=True and blank=True in Django? - Stack Overflow
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10. What is the difference between null=True and blank=True? — Django ORM Cookbook 2.0 documentation
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Django model data types
23130 (Supplying choices to BooleanField without default yields blank choice even if blank=False) – Django
python - What is the difference between null=True and blank=True in Django? - Stack Overflow
Django Null vs Blank. So here I'm gonna explain to you when… | by Satyam | Medium
python - Field is required in the Django Admin even though I have set "blank =True" in the Model - Stack Overflow
The Django Book - Chapter 6 the django admin site
Django multi-select choice field in admin panel - rogulski.it
