APA

Halling R. E., Mueller G. M., .New Species and a new record for the genus Xerula (<Agaricales>) from Costa Rica. : .

Chicago

Halling Roy E, Mueller Gregory M, .New Species and a new record for the genus Xerula (<Agaricales>) from Costa Rica. : .

Harvard

Halling R. E., Mueller G. M., .New Species and a new record for the genus Xerula (<Agaricales>) from Costa Rica. : .

MLA

Halling Roy E, Mueller Gregory M, .: . .