Harrod, Leonard Montague
Harrod;s librarians;glossary
England : Gower Pub, 1987,
 Buku Referensi
Prytherch, Ray
Harrod's librarians' glossary and reference book
Gower, 1987
 Buku Referensi
Prytherch, Ray
Harrod's librarians glossary and reference book : ninth edition
Gower, 2000
 Buku Referensi
Harrod's librarians' glossary and reference book : seventh edition
compiled by Ray Prytherch
Gower, 1990
 Buku Referensi
Sri Harini Mahmudi
Suatu model tree untuk faktorisasi matriks sparse simetri indefinit
Universitas Indonesia, 1990
 UI - Tesis Membership