Open DNS, do not want it open, help, thanks

doing it for the first time

[AjiNIMC]

Our DNS is open, how can I make it otherwise?

options {
directory "/etc";
pid-file "/var/run/named/named.pid";
};
zone "." {
type hint;
file "/etc/db.cache";
};
zone "domain.com" {
type master;
file "/var/named/domain.com.hosts";
};

Should I do

options {
directory "/etc";
pid-file "/var/run/named/named.pid";
    allow-transfer {"none";};
allow-recursion {192.168.3.0/24;3.13.3.0/24;};
};
zone "." {
type hint;
file "/etc/db.cache";
};
zone "domain.com" {
type master;
file "/var/named/domain.com.hosts";
};

By just adding allow-recursion will it do? thanks (I am reading more about DNS server configuration, so please bear my stupid questions)