Markedness

(1) Markedness in sociolinguistics

http://www.analytictech.com/mb119/markedne.htm

(2) Markedness in phonology (Rice, 2007)

https://www.cambridge.org/core/books/cambridge-handbook-of-phonology/markedness-in-phonology/4069AA39DDE6E7B9AC293DA5EAE4F16F

Reference:

Rice, K. (2007). Markedness in phonology. In P. de Lacy (ed.) The cambridge handbook of phonology (pp.79-98). Cambridge University Press. https://doi.org/10.1017/CBO9780511486371.005

(3) Markedness in morphology

https://www.acsu.buffalo.edu/~fertig/Potsdam2014/MorphChangeCourse2-Markedness.pdf

(4) Markedness (advanced)

https://web.stanford.edu/~zwicky/on-markedness.pdf

https://www.ucl.ac.uk/~ucjtudo/Plural/_book/morphological-vs-semantic-markedness.html