Yes, there are two accepted forms for possessive singular nouns ending in s:
Add an apostrophe (') after the existing s at the end of the word: Thomas'
Add an apostrophe s ('s) after the existing s at the end of the word: Thomas's
EXAMPLES
We're on our way to Thomas' party.
We're on our way to Thomas's party.
Note: The -s's is the most commonly used form, but if you are a student, use the form that is preferred by your teacher.
The correct spelling of the possessive form of "scientist" is "scientist's."
The correct spelling of the possessive form of "people" is "people's."
The correct spelling is "gentlemen's".
The correct spelling of the possessive form of "women" is "women's."
The correct possessive form of dynasty is "dynasty's."
The correct spelling for the possessive form of "college" is "college's."
monies'
kids'
heroes
The singular possessive form is story's.
The correct spelling of the singular possessive form of "municipality" is "municipality's."
Yes, pony's is the correct singular possessive form.example: The pony's stall was very clean.