https://www.slideshare.net/HiwrHastear/types-of-culture-media

https://www.easybiologyclass.com/category/difference-between/microbiology-difference-between/

Prokaryotic cell, 

Eukaryotic cell

Bacterial endospore

https://www.easybiologyclass.com/bacterial-endospore-definition-characteristics-structure-and-its-formation/

https://www.easybiologyclass.com/bacterial-endospore-definition-characteristics-structure-and-its-formation/

exotoxins and endotoxins

basic-microbiology/

https://courses.lumenlearning.com/boundless-microbiology/chapter/culturing-bacteria/

https://www.slideshare.net/sasiprasad/culture-methods-9213006

https://nios.ac.in/media/documents/dmlt/Microbiology/Lesson-09.pdf

https://www.biologydiscussion.com/microorganisms/isolation-and-cultivation-of-microorganisms/34290

https://www.selfstudys.com/uploads/pdf/hrCD6dDgYtkvaA6GChOL.pdf