During this time , Willis Barnstone 's Modern European Poetry Anthology became an inexhaustible reference for further reading .
During this time , Willis Barnstone 's Modern European Poetry Anthology spurred Keys on to enroll in graduate school at Indiana University at Bloomington , where Barnstone taught .
During this time , Willis Barnstone 's Modern European Poetry Anthology became an inexhaustible reference for further reading , and spurred Keys on to enroll in graduate school at Indiana University at Bloomington , where Barnstone taught .