Diasystem: Dialectology, Diaphoneme, Morphology (linguistics)

Morphology: Palgrave Modern Linguistics (Macmillan Linguistics)

Morphology (Cambridge Textbooks in Linguistics)

What is Morphology? (Fundamentals of Linguistics)

Alternation (Linguistics): Phoneme, Morpheme, Phonology, Morphology (linguistics), Syntax, Allophone, Allomorph, Linguistics, Apophony, Sibilant consonant