APA-ийн эшлэл(7 дахь хэвлэлт)
Kreeft, P. (1990). Everything you wanted to know about heaven... but never dreamed of asking (First complete edition.). Ignatius Press.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)
Kreeft, Peter. Everything You Wanted to Know About Heaven... but Never Dreamed of Asking. First complete edition. San Francisco: Ignatius Press, 1990.
MLA -ийн эшлэл (9 дэх хэвлэлт)
Kreeft, Peter. Everything You Wanted to Know About Heaven... but Never Dreamed of Asking. First complete edition. Ignatius Press, 1990.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.