Heisch، Allison (1994). "Arguments for an Execution: Queen Elizabeth's 'White Paper' and Lord Burghley's 'Blue Pencil". Albion: A Quarterly Journal Concerned with British Studies. ج. 24 ع. 4: 592–593. DOI:10.2307/4050668. JSTOR:4050668.
jstor.org
Heisch، Allison (1994). "Arguments for an Execution: Queen Elizabeth's 'White Paper' and Lord Burghley's 'Blue Pencil". Albion: A Quarterly Journal Concerned with British Studies. ج. 24 ع. 4: 592–593. DOI:10.2307/4050668. JSTOR:4050668.
web.archive.org
Budiansky، Stephen. "Sir Francis Walsingham". Britannica.com. مؤرشف من الأصل في 2019-10-10. اطلع عليه بتاريخ 2019-07-06.