Template:Citation Style documentation/registration

These parameters add a link note to the end of the citation: Setting registration or subscription to any value other than,  , or   will generate an error message.
 * registration: For online sources that require registration, set yes (or, or  ); superseded by subscription if both are set.
 * subscription: For online sources that require a subscription, set yes (or, or  ); supersedes registration if both are set.