Apostrophes — mostly for possession on the SAT
Plural S and Possessive S || Apostrophe S and S Apostrophe || Learn English Grammar
Apostrophe 'S Correct Uses // Noun in Possessive Case
When to Use “Of” and When to Use the Possessive Form | Learn English Grammar
Apostrophe | Grammar For Kids | Periwinkle
Apostrophes and Possession
Introduction to the possessive | The Apostrophe | Punctuation | Khan Academy
The Apostrophe S - ('S) | Possessive Case - Genitive Case
[Boy's] and [Boys'] | Apostrophe S ('S) Rules
17.6 What are the rules of joint ownership and apostrophes?
Possessive Forms 's / ' | the apostrophe | Basic English for Hong Kong Students
Complete Information About Apostrophe S #apostrophe #englishgrammar
Possessives 'S or S'
Apostrophe - Class II
Making nouns possessive - English Lessons with inlingua Vancouver
Class 3 English Language Apostrophes
Grammar Myths Unlocked: Mastering Apostrophe Usage
Apostrophes - Business Writing & Grammar
I would definitely include the apostrophes on both, to avoid ambiguity. "Writers and teachers' wa...
What's an Apostrophe?