Many books are available. You can also write to localities where the relatives came from but be prepared to speak/write their language. You can also get information from the LDS church via one of their local history centers (go to the web sitewww.genhomepage.com/FHC/all.htmlor consult the Business Section of the White Pages under "Church of Jesus Christ of Latter Day Saints" and look for the Family History Centers).
Carmack, Sharon DeBartolo, A Genealogist's Guide to Discovering Your Immigrant and Ethnic Ancestors, 2000, Betterway Publications, Virginia, $19 (see her other books at her web site atwww.warrencarmack.com/sharon/aboutsharon.htm)
Colletta, John P., Ph.D, They Came in Ships: A Guide to Finding Your Immigrant Ancestor’s Ship, 1996, Ancestry Publishing Co, Salt Lake City, $100
Crawford-Oppenheimer, Christine, Long Distance Genealogy: Researching Your Family History From Home, 2000, Betterway Publications, Virginia, $19
Eakle, Arlene and Cerny, Johni, The Source: A Guidebook of American Genealogy, 1984, Ancestry Publishing Co, Salt Lake City (book was revised in 1997 by Kory L. Meyerink and, Loretto D. Szucs)
Szucs, Loretto Dennis, They Became Americans: Finding Naturalization Records and Ethnic Origins, 1998, Ancestry Publishing Co, Salt Lake City, $20