This is the information as Fold3 provides:
Fold3, Pension Numerical Index (/title/851/pension-numerical-index : accessed October 12, 2019), database and images, https://www.fold3.com/title/851/pension-numerical-index
Publication Title:
Numerical Index to Pensions, 1860-1934
Content Source:
The National Archives
Publication Number: A1158
Content Source: NARA
Content Partner: NARA
Source Publication Year: N/A
Fold3 Publication Year: 2012
Fold3 Job: 12-049
NARA Catalog Id: See NARA
NARA Catalog Title: Pending
Language: English
Country: United States
Record Group: 15
Short Description: NARA A1158. Pensions indexed by number for Army or Navy service in the Civil War and later, 1860-1934.
Roll: A1158_0105
Full Name: Babcock, Charles B
Conflict Period: Civil War (Union)
Military Branch: Army
Pension Type: Dependent Pension Certificate (WC)
State/Organization of Service: Wisconsin
Served For: United States of America
This is additional information from the image:
Unit: G, 37 Wisconsin Infantry
Pension Number: 413717
I would format the source (you can just copy/paste if suits):
The National Archives. ''Numberical Index to Pension, 1860-1934,'' Roll: A1158_0105; database and digital images, "Pension Numerical Index" (/title/851/pension-numerical-index : accessed October 12, 2019), database and images, https://www.fold3.com/title/851/pension-numerical-index ; citing Pension Number: 413717