- TIBCO Support Portal. support.tibco.com. [2022-05-13]. （原始内容存档于2022-05-15）.
- The Dangers of Self-Signed Certificates. GlobalSign GMO Internet, Inc. 2020-02-05 [2022-05-13]. （原始内容存档于2022-03-08） （英语）.
- What is a Root Certificate? - DNSimple Help. support.dnsimple.com. [2022-05-13]. （原始内容存档于2022-04-20）.
- View Security Certificate Errors. www.digicert.com. [2022-05-13]. （原始内容存档于2022-05-09）.
- RFC 4158. IETF （英语）.
all of the end entities and relying parties use a single "Root CA" as their trust anchor. If the hierarchy has multiple levels, the Root CA certifies the public keys of intermediate CAs (also known as subordinate CAs). These CAs then certify end entities' (subscribers') public keys or may, in a large PKI, certify other CAs.