List of DNS record types - Wikipedia

DNS Lookup

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How do I configure DNS records for a mail server? - Synology

Guide to DNS record types – NS1 Help Center

Basic DNS records – DreamHost Knowledge Base

NsLookup - Find DNS Records

DNS records explained: A, AAAA, NS, MX and CNAME – Peter Brumby

10 most used Nslookup commands - ClouDNS Blog

List of DNS Record Types, PDF, Directories

DNS server types

En/4.0/Domain Name System (DNS) - Zentyal Linux Small Business Server