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would you write:
Dr. Seuss's birthday

or

Dr. Seuss' birthday
Comments  
When you're referring to one person, the apostrophe comes before the s, so Dr. Seuss's birthday is the correct one.

Another example:

Toys that belong to the girl ----> The girl's toys
Toys that belong to the girls ----> The girls' toys
Dr Seuss' birthday
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Nouns of one syllable form the possessive with 's.

Hess's, Wess's, Seuss's, etc.

Nouns of more than one syllable ending in an s or z sound form the possessive with just an apostrophe OR apostrophe and s. Jesus' or Jesus's; Cummings' or Cummings's.
thanx,it helped me with my homework
IkiaNouns of one syllable form the possessive with 's.

Hess's, Wess's, Seuss's, etc.

Nouns of more than one syllable ending in an s or z sound form the possessive with just an apostrophe OR apostrophe and s. Jesus' or Jesus's; Cummings' or Cummings's.
it didn't help me
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Dr. Suess's birthday
thanks for the help i needeed it....);

cummings' or cummings's

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