APA

Halling R. E., .Synopsis of marasmius section globulares (<Tricholomataceae>) in the United States. : .

Chicago

Halling Roy E, .Synopsis of marasmius section globulares (<Tricholomataceae>) in the United States. : .

Harvard

Halling R. E., .Synopsis of marasmius section globulares (<Tricholomataceae>) in the United States. : .

MLA

Halling Roy E, .: . .