http://www.issia.cnr.it/ http://www.ba.iac.cnr.it/wp/ https://ntnucamp.sce.ntnu.edu.tw/ http://leda.elfak.ni.ac.rs/

Gaya APA

Piper, J. (2006). When the Darkness Will Not Lift: Doing What We Can While We Wait for God—and Joy (First Edition). Wheaton, Illinois: Crossway Books.

Gaya MLA

Piper, John. "When the Darkness Will Not Lift: Doing What We Can While We Wait for God—and Joy". First Edition Wheaton, Illinois: Crossway Books, 2006. e-book.