possessive pronouns of martha katz's?

http://www.englishclub.com/grammar/pronouns-possessive.htm

To determine the possessive pronouns for "Martha Katz's," you need to understand possessive pronouns and how they are formed.

Possessive pronouns are used to indicate ownership or possession. They replace a noun to show that something belongs to someone or something.

In this case, "Martha Katz's" indicates that something belongs to Martha Katz. The possessive pronouns you can use are:

1. Her: This is the third-person singular possessive pronoun for Martha Katz. You can use it when referring to something that belongs to Martha Katz only.

Example: "That is Martha Katz's book. Her book is on the table."

2. Hers: This is the possessive pronoun for Martha Katz, used when replacing a noun that belongs to her.

Example: "The car is Martha Katz's. The car is hers."

Remember that possessive pronouns do not require an apostrophe ('s) when forming the possessive form. The possessive form is only used when indicating ownership with a noun (e.g., "Martha Katz's car"). When using a pronoun, like in the examples above, you don't need to add an apostrophe.

So, the possessive pronouns for "Martha Katz's" are "her" and "hers."