Shakespeare's Sonnet 98 - "From you have I been absent in the spring," - YouTube
Allusion in Shakespeare's Sonnets - Owl Eyes
Sonnet 107 - Wikipedia
Sonnet 98 Shakespeare - Sonnet #98 From you have I been absent in the spring When proud-pied April dressed in all his trim Hath put a spirit of youth | Course Hero
Shakespeare's Sonnet 98: From you have I been absent in the spring - Poem Analysis